The EVEN MORE Complete Polymorph Thread 3.5

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Taken and mildly updated from The Complete Polymorph Thread 3.5 by Megaplex. Funny Slaughter is the author of the original polymorph 3.5 thread from which a lot of this material has been pulled.

Polymorph spell description on d20srd

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Polymorph
Transmutation
Level:    Adp 4, Arc 4, HB 4, Sor/Wiz 4, Transformation 5, Wuj 4; Witch 4 (DMG), Vadalis Beastkeeper 4 (Dragonmarked)
Components:    V, S, M
Casting Time:    1 standard action
Range:    Touch
Target:    Willing living creature touched
Duration:    1 min./level (D)
Saving Throw:    None
Spell Resistance:    No
This spell functions like alter self, except that you change the willing subject into another form of living creature. The new form may be of the same type as the subject or any of the following types: aberration, animal, dragon, fey, giant, humanoid, magical beast, monstrous humanoid, ooze, plant, or vermin. The assumed form can’t have more Hit Dice than your caster level (or the subject’s HD, whichever is lower), to a maximum of 15 HD at 15th level. You can’t cause a subject to assume a form smaller than Fine, nor can you cause a subject to assume an incorporeal or gaseous form. The subject’s creature type and subtype (if any) change to match the new form.
Upon changing, the subject regains lost hit points as if it had rested for a night (though this healing does not restore temporary ability damage and provide other benefits of resting; and changing back does not heal the subject further). If slain, the subject reverts to its original form, though it remains dead.
The subject gains the Strength, Dexterity, and Constitution scores of the new form but retains its own Intelligence, Wisdom, and Charisma scores. It also gains all extraordinary special attacks possessed by the form but does not gain the extraordinary special qualities possessed by the new form or any supernatural or spell-like abilities.
Incorporeal or gaseous creatures are immune to being polymorphed, and a creature with the shapechanger subtype can revert to its natural form as a standard action.
Material Component: An empty cocoon.

There are two common uses for the Polymorph spell:

• Combat prowess
  The simplest way to optimize this is to use a humanoid like form with high Strength, wield an appropriately sized weapon and go to town. Another aspect is to change into a form that has many natural attacks or high damage natural attacks. However, do not overlook the Special Attacks that some of these creatures have. Poisons, brain extraction, rend, pounce, improved grapple, etc are all good ways to end a fight before it even gets started.
• Utility
  There are some forms that can do more than just combat: Flying transportation for you and your friends, taking out large metal objects such as bars, gates or golems, natural invisibility for scouting. In addition to the Polymorph spell there are other Transmutation spells in the Spell Compendium that each allow only a specific shape and abilities. PHB2 and Complete Mage also have the Polymorph Subschool which radically changes the way that spells of that Subschool work.

For detailed information about what polymorph gives and what it takes, read Surreal's Polymorph, Wild Shape and Shapechange comparison charts: http://brilliantgameologists.com/boards/index.php?topic=3479.0
New link: http://www.minmaxboards.com/index.php?topic=9635

Don't forget when you polymorph into a creature you turn into that type and subtype (not incorporeal/gaseous). Specific types have common natural abilities:

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• Dragon Type
  Immunity to magic sleep effects and paralysis effects.
• Giant Type
  Proficient with all simple and martial weapons
• Ooze Type
  Blind, with immunity to gaze attacks, visual effects, illusions, and other attack forms that rely on sight.
  Immunity to poison, sleep effects, paralysis, polymorph, and stunning.
  Not subject to critical hits, sneak attacks or flanking.
• Plant Type
  Immunity to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects)
  Immunity to poison, sleep effects, paralysis, polymorph, and stunning.
  Not subject to critical hits or sneak attacks.
• Cold Subtype
  A creature with the cold subtype has immunity to cold. It has vulnerability to fire (+50% damage)
• Fire Subtype
  A creature with the fire subtype has immunity to fire. It has vulnerability to cold (+50% damage)
• Air Subtype
  Air creatures always have fly speeds and usually have perfect maneuverability. You gain the assumed form's fly speed.
• Earth Subtype
  Earth creatures usually have burrow speeds, and most earth creatures can burrow through solid rock. You get the assumed form's speed.
• Water Subtype
  Creatures with the water subtype always have swim speeds and can move in water without making Swim checks. A water creature can breathe underwater and usually can breathe air as well. You gain the assumed form's swim speed.

Rules of the Game articles on wizards.com

• Polymorphing (Part One)
• Polymorphing (Part Two)
• Polymorphing (Part Three)
• Polymorphing (Part Four)
• Polymorphing Revisited (Part One)
• Polymorphing Revisited (Part Two)
• Polymorphing Revisited (Part Three)
• Polymorphing Revisited (Part Four)

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I call these Combat Only forms as they do not have a Humanoid like form that would allow you to continue to wear your armor and use your weapons. So in most of these forms you will use the natural attacks of the form to deal damage.

Note: You will need to change the attack entry to reflect your BAB and new (polymorphed) Strength score. You're also losing feats (except racial), so don't include those weapon focuses or improved natural attacks.

Level 7
    * Cloaker: Large, Fly 40 ft., NA +7, Str 21, Dex 16, Con 17; MM/SRD
      Attack: Tail slap +8 melee (1d6+5) and bite +3 melee (1d4+2)
      Benefits: Engulf (ex), Moan (ex): Unnerve, Fear, Nausea or Stupor (must read!)

    * Griffon: Large, Fly 80 ft., NA +6, Str 18, Dex 15, Con 16; MM/SRD
      Attack: bite/claw/claw
      Benefits: pounce, rake

    * Hydra (7 heads): Huge, Reach 10 ft; Str 19; Dex 12; Con 20; NA +8; MM/SRD
      Attack: 7 bites +10 melee (1d10+4)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

    * Lammasu: Large, Fly 60, NA +10, Str 23, Dex 12, Con 17; MM/SRD
      Attack: 2 claws +12 melee (1d6+6)
      Benefits: Pounce (Ex) On a charge it can make a full attack, including two rake attacks. Rake (Ex) Attack bonus +12 melee, damage 1d6+3.

    * Naga, Water: Aquatic, Large, NA +5, Str 16, Dex 13, Con 18; MM/SRD
      Attack: Bite +7 melee (2d6+4 plus poison)
      Benefit: Poison (Ex) Injury, Fortitude DC 17, initial and secondary damage 1d8 Con.

    * Remorhaz: Huge, NA +11, Str 26, Dex 13, Con 21; MM/SRD
      Attack: Bite +13 melee (2d8+12)
      Benefit: Burrow 20', Improved Grab (ex), Swallow Whole (Ex) Swallowed opponents take 2d8+12 damage plus 8d6 Fire damage per round

    * Wyvern: Dragon, Large, Fly 60, NA +8, Str 19, Dex 12, Con 15; MM/SRD
      Attack: Sting +10 melee (1d6+4 plus poison) and bite +8 melee (2d8+4) and 2 wings +8 melee (1d8+2) and 2 talons +8 melee (2d6+4)
      Benefits: Poison (Ex) Injury, Fortitude DC 17, initial and secondary damage 2d6 Con.
      Dragon Type -- Immunity to magic sleep effects and paralysis effects.

Level 8
    * Dire Lion: Large, NA +4, Str 25, Dex 15, Con 17; MM/SRD
      Attack: 2 claws +13 melee (1d6+7) and bite +7 melee (1d8+3)
      Benefits: Improved Grab (Ex), Pounce (Ex) On a charge can full attack, including two rake attacks. Rake (Ex) Attack bonus +12 melee, damage 1d6+3.

    * Digester: Medium, NA +5, Str 17, Dex 15, Con 17; MM/SRD
      Full Attack: Claw +11 melee (1d8+4)
      Benefits: Acid Spray(Ex) 20-foot cone (4d8 damage) every 1d4 rounds. Stream of acid (8d8 damage) to a single target within 5 feet. In either case, a DC 17 Reflex save halves the damage.

    * Umber Hulk: Large, Reach 10’, Burrow 20, NA +8, Str 23, Dex 13, Con 19; MM p.248
      Attack:  2 Claws +11 melee (2d4+6) and Bite +9 melee (2d8+3)
      Benefits: Burrow 20’, Multiattack Feat, Listen +11

    * Hydra (8 heads): Huge, Reach 10 ft; NA +9; Str 19; Dex 12; Con 20; MM/SRD
      Attack: 8 bites +11 melee (1d10+4)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

Level 9
    * Behir: Huge, NA +11, Str 26, Dex 13, Con 21; MM/SRD
      Attack: Bite +15 melee (2d4+12)
      Benefits: Improved Grab (ex), Constrict (Ex) 2d8+8 damage, Can make 6 rake attacks as well. Rake (Ex) 6 claws +15 melee (1d4+4)

    * Darktentacles: Large, Reach 15 ft; NA +7; Str 19; Dex 15; Con 17;  MM2 p.54
      Attack: 12 slams +9 melee (1d4+4) or 12 light weapons
      Benefits: Improved Grab (ex) and Constrict (ex): 2d6+6

    * Hydra (9 heads): Huge, Reach 10 ft; NA +10; Str 21; Dex 12; Con 20;  MM/SRD
      Attack: 9 bites +13 melee (1d10+5)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

    * Naga, Dark: Large, NA +3, Str 14, Dex 15, Con 14; MM/SRD
      Attack:  Sting +7 melee (2d4+2 plus poison) and bite +2 melee (1d4+1)
      Benefit: Poison (Ex) Injury, Fortitude DC 16 or nightmare-haunted sleep for 2d4 minutes.

    * Naga, Spirit: Large, NA +6, Str 18, Dex 13, Con 18; MM/SRD
      Attack: Bite +9 melee (2d6+6 plus poison)
      Benefit: Poison (Ex) Injury, Fortitude DC 18, initial and secondary damage 1d8 Con

Level 10
    * Roper: Large, 50' reach with strand, NA +14, Str 19, Dex 13, Con 17; MM/SRD
      Benefits: Strands (Ex) Fires up to six strands, they can strike up to 50 feet away. Weakness (Ex) DC 18 Fortitude save or take 2d8 points of Strength damage.

    * Hydra (10 heads): Huge, Reach 10 ft; NA +11; Str 21; Dex 12; Con 20;  MM/SRD
      Attack: 10 bites +14 melee (1d10+5)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

Level 11
    * Chuul: Large, NA +10, Str 20, Dex 16, Con 18; MM/SRD
      Attack: 2 claws +12 melee (2d6+5)
      Benefits: Constrict 3d6+5, Improved Grab, Paralytic Tentacles(Ex): DC 19 Fort save or Paralyzed

    * Hydra (11 heads): Huge, Reach 10 ft; NA +12; Str 23; Dex 12; Con 20;  MM/SRD
      Attack: 11 bites +16 melee (1d10+6)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

    * Naga, Guardian: Large, NA +7, Str 21, Dex 14, Con 19; MM/SRD
      Attack: Bite +12 melee (2d6+7 plus poison) or spit +9 ranged touch (poison)
      Benefit: Poison (Ex) Injury or contact, Fortitude DC 19, initial and secondary damage 1d10 Con.

Level 12
    * Hydra (12 heads): Huge, Reach 10 ft; NA +13; Str 23; Dex 12; Con 20;  MM/SRD
      Attack: 12 bites +17 melee (1d10+6)
      Benefits: Hydras can attack with all their heads at no penalty, even if they move or charge during the round.

    * Thoon Elder Brain: Large, Reach 10 ft; NA +15; Str 26; Dex 14; Con 30; MM5
      Attack: 8 tentacles +17 melee (1d6+8+2d6 acid)
      Benefits: Acid burn (wounds deal 4d6 acid next turn); Dual action (two rounds of actions per turn)

Level 13
    * Red Dragon, Young, Large, Fly 150, NA +12, Str 25, Dex 10, Con 17
      Attack: 1 bite +19 melee (2d6+4), 2 claws +14 melee (1d8+2), 2 wings +14 melee (1d6+2) and 1 tail slap +14 melee (1d8+6)

Level 14
    * Gold Dragon, Young, Large, Fly 200, NA +13, Str 25, Dex 10, Con 17
      Attack: 1 bite +20 melee (2d6+4), 2 claws +15 melee (1d8+2), 2 wings +15 melee (1d6+2) and 1 tail slap +15 melee (1d8+6)

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Humanoid like combat forms allow you to use weapons and cast spells.

Level 7
    * Troll, Bladerager
      Benefits: Large Giant, speed 20 feet, +5 NA, 2 claws (2d6+str) and bite (2d6+1/2 Str), Str 28, Dex 16, Con 28, Pounce, Rend; MM5

    * Annis Hag, Large, NA +10, Str 25, Dex 12, Con 14; MM/SRD
      Benefits: Improved Grab, Rake, Rend

    * Gloura; Fey; Medium; Fly 60, Str 10; Dex 21; Con 14; Underdark

    * Girallon: Magical Beast, Medium, NA +4, Str 22, Dex 17, Con 14; MM
      Benefits: +8 climb, 4 claws and 1 bite attack, Rend(ex)

    * Phthisic, Large, monstrous humanoid, NA+8, Str 23, Dex 12, Con 21; XPH/SRD
      Benefits: 2 claws + bite, Mind Feed(Ex): 1d4 Int damage bite attack

    * Rhek; monstrous humanoid (extraplanar); Medium; NA +7; Str 19; Dex 10; Con 19; Book of Exalted Deeds

    * Treant; Plant, Huge, NA +13, Str 29, Dex 8, Con 21; MM/SRD

Level 8
    * Mind Flayer; Aberration, Medium, NA +3, Str 12, Dex 14, Con 12; MM
      Benefits: Improved Grab (Ex) , Extract (Ex): extract brain!

    * Umber Hulk; Aberration; Large; NA +8, Str 23, Dex 13, Con 19; MM/SRD
      Benefits: Burrow 20’, 2 Claws (2d4) & 1 Bite (2d8), Multiattack Feat, Listen +11;

Level 9
    * Troll, Cave: Giant, Large, NA +11, Str 29, Dex 13, Con 27; MM3 p.177
      Benefits: Pounce, Rake, Rend, Improved Grab and Dazing Blow(Ex): DC 22 Fort or dazed

Level 10
    * Gulgar: MHumanoid, Large, NA +8, Str 20, Dex 7, Con 17; MM2
      Benefits: Crystalline Bone (Ex): natural attacks treated as adamantine, Sonic Pulse (Ex): 30-foot cone 3d6 sonic damage, deafen foes

    * Gray Render: Magical Beast, Large, NA +10, Str 23, Dex 10, Con 24; MM/SRD
      Benefits: Improved grab(ex), Rend(ex) 2d6+9

Level 12
    * Shrieking Hag: MHumanoid, Medium, Fly 80, NA +10, Str 20, Dex 13, Con 16, Unapp. East

    * Maur Giant: (Earth); Large; NA +9; Str 25; Dex 10; Con 20; Underdark p.95

    * Troll, War: MHumanoid, Large, NA +14, Str 31, Dex 16, Con 29, MM2 p.181
      Benefits: Dazing Blow(Ex): DC 25 Fort save or opponent dazed

Level 13
    * Firbolg, Giant, Large, NA +12, Str 36, Dex 13, Con 23; MM2 p.102
      Benefits: rock throwing, trample

    * Legendary Ape: Animal, Large, NA +6, Str 30, Dex 17, Con 16; MM2

    * Sun Giant, Giant (fire), Huge, NA +10, Str 37, Dex 14, Con 25; MM2
      Fire Subtype -- A creature with the fire subtype has immunity to fire. It has vulnerability to cold (+50% damage)

Level 14
    * Stone Giant, large, NA +11, Str 27, Dex 15, Con 19; MM/SRD
      Benefits: rock throwing, +8 racial bonus on Hide checks in rocky terrain

Level 15
    * Sand Giant: Large, NA +11, Str 27, Dex 21, Con 21; MM3 p. 59

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Bypassing metal barriers or combat with metal creatures:
    * Rust Monster: 5 HD, Medium, NA +5, Special Attacks: Rust
      Rust (Ex): A rust monster that makes a successful touch attack with its antennae causes the target metal to corrode, falling to pieces and becoming useless immediately. The touch can destroy up to a 10-foot cube of metal instantly.

Bypassing crystalline barriers (or combat with crystalline creatures?):
    * Folugub: 4 HD, Medium, NA +5, Special Attacks: Liquefy Crystal
      Liquefy Crystal (Ex): A folugub that makes a successful touch attack with its tongue causes the target crystal to change phase, turning immediately from solid to liquid and becoming worthless. The touch can destroy up to a 5-foot cube of crystal instantly. Magic or psionic items made of crystal (including crystalline armor and weapons) must succeed on a DC 19 Reflex save or be liquefied. The save DC is Constitution-based and includes a +4 racial modifier. A crystalline weapon that deals damage to a folugub becomes liquefied immediately.

Sneaking or scouting:
    * Will-O’-Wisp: 9 HD, Small, Fly 50 (perfect), Str 1, Dex 29, Con 10
      Normally, you do not gain Special Abilities of a creature, however, you do gain abilities that are "natural abilities"
      Natural Invisibility (Ex): A startled or frightened will-o’-wisp can extinguish its glow, effectively becoming invisible as the spell (questionable)

Flying transport:
    * Cloaker: 6 HD, Large, Fly 40, NA +7, Str 21, Dex 16, Con 17; MM/SRD
      Attack: Tail slap +8 melee (1d6+5) and bite +3 melee (1d4+2)
      Benefits: Engulf (ex), Moan (ex): Unnerve, Fear, Nausea or Stupor (must read!)
      As a Large creature with a 21 strength, a cloaker can carry just over 600 pounds while flying!

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You must be of the type Outsider before you can use these forms. See section Miscellaneous to learn how to be an outsider.

Abilities granted by polymorphing into outsider type and various subtypes (based on this).

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• Angel Subtype
  -- Immunity to acid, cold, and petrification.
  -- +4 racial bonus on saves against poison.
• Archon Subtype
  -- Immunity to electricity and petrification.
  -- +4 racial bonus on saves against poison.
• Baatezu Subtype (FCII)
  -- Immunity to fire and poison.
  
• Deva Subtype (Fiend Folio)
  -- Immunity to electricity and petrification.
  -- +4 racial bonus on saves against poison.
• Eladrin Subtype (BoED p.168)
  -- Immunity to electricity and petrification.
• Guardinal Subtype (BoED p.173)
  -- Immunity to electricity and petrification.
  -- +4 racial bonus on saves against poison.
• Outsider Type
  -- Proficient with all simple and martial weapons
• Tanar’ri subtype (MM1)
  -- Immunity to electricity and poison.
  

Level 7
    * Avoral; Outsider (Good), medium, NA +8, Fly 90ft, Str 15, Dex 23, Con 20; MM/SRD

    * Babau: Outsider (evil), medium, NA +9, Str 20, Dex 12, Con 20; MM/SRD
      Benefits: +2d6 sneak attack, +8 racial bonus on Hide, Listen, Move Silently, and Search checks.

    * Bralani: Outsider (good), Medium, Fly 100, NA +6, Str 18, Dex 18, Con 17; MM/SRD

    * Dune Stalker, Outsider(evil), medium, NA +7, Str 16, Dex 10, Con 14; MM2 p.88

    * Red Slaad, Outsider, Large, NA +8, Str 21, Dex 15, Con 17, MM
      Benefits: Pounce(Ex): make a full attack on a charge

    * Xill; Outsider (Extraplanar); Medium; NA +7; Str 15, Dex 16, Con 15; MM/SRD
      Benefits: Implant, Improved Grab

Level 8
    * Blue Slaad: Outsider, Large, NA +9, Str 23, Dex 15, Con 19; MM/SRD

    * Firre: Outsider (Eladrin), Medium, Fly 90, NA +12, Str 20, Dex 14, Con 12, Int 17; BoED
      Eladrin Subtype -- Immunity to electricity and petrification.

    * Palrethee, Outsider (evil), Medium, NA +10, Str 19, Dex 16, Con 16, Int 13; MM2 p.58
      Benefits: Demonic Burn(Ex) melee attack, save DC 17 reflex or catch fire for 1d4 rounds

    * Lupinal, Outsider (guardinal), Medium, NA +3, Str 23, Dex 20, Con 13, Int 16, MM2 p.43
      Guardinel Subtype -- Immunity to electricity and petrification.

    * Night Hag, Outsider(evil), Medium, NA +11, Str 19, Dex 12, Con 18; MM/SRD

    * Warden Archon, Outsider (archon), Large, NA +12, Str 27, Dex 11, Con 17, Int 16; BoED
      Archon Subtype -- Immunity to electricity and petrification.

Level 9
    * Amnizu, Outsider(evil), Medium, Fly 60, NA +11, Str 12, Dex 11, Con 13, Int 16; MM2 p.67

    * Green Slaad: Outsider, Large, NA +13, Str 23, Dex 13, Con 19; MM

    * Erinyes, Outsider(evil), Medium, Fly 50, NA +8, Str 21, Dex 21, Con 21, Int 14; MM/SRD
      Feats: Dodge, Mobility

Level 10
    * Bone Devil, Outsider(evil), large, NA +11, Str 21, Dex 21, Con 21, Int 14; MM/SRD
      Benefits: Poison(Ex) Injury, Fort DC 20, 1d6 STR / 2d6 str

    * Ghaele, Outsider(good), medium, 50ft, NA +14, Str 25, Dex 12, Con 15, Int 16; MM/SRD
      Benefits: Light Ray(Ex) Ranged touch, 2d12 damage, overcomes all types of DR

    * Hezrou, Outsider(evil), large, NA +14, Str 21, Dex 10, Con 29, Int 14; MM/SRD
      Benefits: +8 listen, spot, Improved Grab, Stench(Ex) DC24 Fort save or be nauseated,

    * Jarilith, Outsider(chaotic,evil), large, NA +14, Str 35, Dex 29, Con 27, Int 8; MM2
      Benefits: Frightful presence, improved grab, pounce, rake

    * Monadic Deva, Outsider (Deva, Good), Medium, fly 90, NA +12, Str 20, Dex 16, Con 20, Int 17; Fiend Folio p. 56
      Deva Subtype -- Immunity to electricity and petrification.

    * Yagnoloth; Outsider; Large; NA +10; Str 30; Dex 14; Con 19, Int 15; MM2 p.203
      Benefits: Stunning Blow(Ex): Fortitude save DC25 or be stunned

Level 11
    * Rakshasa, Naztharune, Outsider, Medium, NA +5, Str 14, Dex 20, Con 18, Int 15; MM3 p.136
      Benefits: Sneak Attack (ex) +6d6

    * Sword Archon, Outsider (Archon,Good), Large, 10/10, Fly 90, NA +14, Str 25, Dex 17, Con 14, Int 12; BoED
      Archon Subtype -- Immunity to electricity and petrification.

Level 12
    * Arcanaloth, Outsider (evil), medium, Fly 50, NA +15, Str 11, Dex 16, Con 11, Int 20; MM2 p.203
      Benefits: Poison(Ex): Injury Fort DC 16, 1 Str damage with each claw attack

    * Astral Deva: Outsider (Angel, Good), medium, Fly 100, NA +15, Str 22, Dex 18, Con 18, Int 18; MM/SRD
      Angel Subtype -- Immunity to acid, cold, and petrification.

    * Barbed Devil, Outsider (evil), large, NA +13, Str 23, Dex 23, Con 23, Int 12; MM/SRD
      Benefits: Impale(Ex) Deals 3d8+9 damage with grapple, Improved Grab,

    * Glabrezu, Outsider (tanar'ri, evil), huge, NA +19, Str 31, Dex 10, Con 31, Int 16;
      Benefits: +8 listen, spot, Improved Grab, 5 natural attacks (2 pincer, 2 claw, 1 bite), ability to wield weapons and cast spells

    * Kelvezu (Demon); Outsider(evil); medium; Fly 60; NA +15; Str 21, Dex 31, Con 16, Int 17; MM2 p.60
      Benefits: Poison(Ex): Injury Fort DC 19, 1d6 CON / 1d6 Con, Sneak Attack +8d6;

    * Leonal, Outsider(good), medium, NA +14, Str 27, Dex 17, Con 20, Int 14; MM/SRD
      Benefits: +4 balance, hide, move silently, Pounce (Full attack on charge), Improved Grab, Rake

Level 14
    * Ice Devil (Gelugon): Outsider (Evil), Large, NA +18, Str 23, Dex 21, Con 23, Int 22; MM/SRD
      Benefits: Int of 22 makes this a good target for Polymorph Any Object

    * Planetar, Outsider (Angel, Good), Large, Fly 90, NA +20, Str 25, Dex 19, Con 20, Int 22; MM/SRD
      Benefits: Int of 22 makes this a good target for Polymorph Any Object
      Angel Subtype -- Immunity to acid, cold, and petrification.

Level 15
    * Horned Devil, Outsider(evil), Large, Fly 50, NA +19, Str 31, Dex 25, Con 25, Int 14; MM/SRD

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Draconic Polymorph (Draconomicon p.79)
Level: Sor/Wiz 5
Max HD raised to 20, untyped bonus to Str +8 and Con +2

Level 16
    * Marilith: Outsider (evil), Large, NA +16, Str 29, Dex 19, Con 29, MM/SRD
      Benefits: Improved Grab(ex), Constrict(ex): 4d6+13

Level 18
    * Pit Fiend: Outsider (evil), Large, Fly 60, NA +23, Str 37, Dex 27, Con 27; MM/SRD
      Benefits: Constrict (Ex), Improved Grab (Ex), Poison (Ex): Injury, Fortitude DC 27, damage 1d6 Con

    * Tulani: Outsider(good), Medium, Fly 90, NA +20, Str 20, Dex 22, Con 22; BoED

Level 20
    * Balor: Outsider(evil), Large, Fly 90, NA +19, Str 35, Dex 25, Con 31; MM/SRD

    * Titan: Outsider(chaotic), Huge, NA +19, Str 43, Dex 12, Con 39; MM

Polymorph Any Object - Sor/Wiz 8, Trickery 8, Commerce 9 (ECS), Transformation 8
The Polymorph Any Object spell allows you to take the form of objects, which opens up Constructs and Undead as additional forms you can assume. In addition, you gain the Intelligence score of the new form.
Clarification: This article says constructs and undead are valid forms, however, the 3.5 FAQ says no.

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• Construct Type
  -- No Constitution score.
  -- Immunity to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects).
  -- Immunity to poison, sleep effects, paralysis, stunning, disease, death effects, and necromancy effects.
  -- Cannot heal damage on their own, but you often can be repaired by exposing yourself to a certain kind of effect (see the creature's description for details) or through the use of the Craft Construct feat. A construct with the fast healing special quality still benefits from that quality.
  -- Not subject to critical hits, nonlethal damage, ability damage, ability drain, fatigue, exhaustion, or energy drain.
  -- Immunity to any effect that requires a Fortitude save (unless the effect also works on objects, or is harmless).
  -- Not at risk of death from massive damage. Immediately destroyed when reduced to 0 hit points or less.
  -- Because its body is a mass of unliving matter, a construct is hard to destroy. It gains bonus hit points based on size, as shown on the table in the Monster Manual glossary.
  -- Constructs do not eat, sleep, or breathe.
• Elemental Type
  -- Immunity to poison, sleep effects, paralysis, and stunning.
  -- Not subject to critical hits or flanking.
  -- Elementals do not eat, sleep, or breathe.
• Undead Type
  -- No Constitution score.
  -- Immunity to all mind-affecting effects (charms, compulsions, phantasms, patterns, and morale effects).
  -- Immunity to poison, sleep effects, paralysis, stunning, disease, and death effects.
  -- Not subject to critical hits, nonlethal damage, ability drain, or energy drain. Immune to damage to its physical ability scores (Strength, Dexterity, and Constitution), as well as to fatigue and exhaustion effects.
  -- Cannot heal damage on its own if it has no Intelligence score, although it can be healed. Negative energy (such as an inflict spell) can heal undead creatures. The fast healing special quality works regardless of the creature's Intelligence score.
  -- Immunity to any effect that requires a Fortitude save (unless the effect also works on objects or is harmless).
  -- Uses its Charisma modifier for Concentration checks.
  -- Not at risk of death from massive damage, but when reduced to 0 hit points or less, it is immediately destroyed.
  -- Undead do not breathe, eat, or sleep.

Construct Forms
    * Zelekhut: 8 HD, Construct, Large, Fly 60, NA +10, Str 21, Dex 11, Con 0, Int 10; MM/SRD
      Full Attack: 2 spiked chains +10 melee (2d6+5 plus 1d6 electricity)
      Benefits: Construct traits, Fast Healing 5, It can cause two spiked chains to spring forth from its forearms as a free action. In similar fashion, it can cause a pair of golden metallic wings to emerge from its back. Retracting the chains or the wings is also a free action.

    * Nimblewright: 10 HD, Construct, Medium, NA +7, Str 19, Dex 24, Con -, Int 10; MM3 p.162
      Full Attack: 2 rapier-hands +11 melee (2d6+4/12-20)
      Benefits: Construct traits

    * Marut: 15 HD, Construct, Large, NA +16, Str 35, Dex 13, Con -, Int 12; MM/SRD

Metamorphosis
Metamorphosis is a 4th level egoist power. It is rather similar to polymorph.
Discussion on the differences by Garryl:

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Metamorphosis (Egoist 4) as compared to Polymorph (Sor/Wiz 4):
Metamorphosis uses an exclusive selection procedure for determining the types you can turn into (all but construct, elemental, outsider, and undead), while Polymorph uses an inclusive list. Thus, any new types added to the game after the PHB/XPH (like the Deathless type) are allowed forms for Metamorphosis, but not for Polymorph (unless it was added to the allowed types list when introduced or something). Are there any good deathless to metamorph into?
Metamorphosis also allows you to take the form of an object (maximum hardness 14). You can still manifest powers as an object, but the first one you do ends the power. As an object, Metamorphosis's duration is 1 hour/level instead of 1 minute/level.

Greater Metamorphosis (Egoist 9) vs. Shapechange (Drd 9, Sor/Wiz 9):
Greater Meta is 1 min/level (1 hour/level as an object). Shapechange is a flat 10 min/level.
Greater Meta costs 200 xp. Shapechange costs nothing, but has a 1500 gp focus.
Greater Meta changes form as a swift action, Shapechange as a free action. Both can only be done 1/round.
Greater Meta can turn you into an object (similar to regular Metamorphosis, but it doesn't impede your manifesting).

Construct forms for a metamorphed psicrystal (by CrimsonDeath taken from here)

Zelekhut: 8HD, Large, speed 50, Fly 60 (average), NA +10, Str 21, Dex 11; MM/SRD
Attack: 2 Spiked Chain +10 melee (2d6+5+1d6 electricity)
Benefits: Lawful subtype, quadruped

Retriever: 10HD, Huge, Speed 50, NA +10, Str 31, Dex 17; MM/SRD
Attack: 4 claws +15 melee (2d6+10), Bite +10 melee (1d8+5)
Benefits: Improved Grab

Clay Golem: 11HD, Large, Speed 20, NA +14, Str 25, Dex 9; MM/SRD
Attack: 2 slams +14 melee (2d10+7)
Benefits: Berserk, Cursed Wound

Stone Golem: 14HD, Large, Speed 20, NA +18, Str 29, Dex 9; MM/SRD
Attack: 2 slams +18 melee (2d10+9)

Marut: 15HD, Large, speed 40, +16 NA, Str 35, Dex 13; MM/SRD
Attack: 2 slams +22 melee (2d6+12) [Fists of Thunder and Lightning is Su and so doesn't carry over]
Benefits: Lawful subtype

I left off the Flesh Golem and animated Objects because they didn't look especially appealing (that is, they didn't seem comparable to other forms that were already available).  I left off the Shield Guardian because it has the same HD as the Marut and lower abilities.  I left off the Homunculus because the only thing it has that a psicrystal lacks is a venomous bite, and you can just put contact poisons on the psicrystal if you want to try something like that.  I left off the Kolyarut because its Su and Sp abilities are what makes it dangerous; without them, it's laughable.

I included the Clay Golem largely because of the Cursed Wound ability, for those annoying enemies who Telport or Plane Shift away after they're down to about half health.  Berserk shouldn't be a huge problem for Psions: If you used Share Power, you can just move more than 5' away and he goes from a 10' tall lump of angry mud to a 1" long harmless rock, and if you manifested it as a touch power you can run for the hills and wait for it to calm down or just dismiss the power.

The best ones are probably the Zelekhut (can carry 459lb aloft at ML 8-- faster and more weight capacity than a Cloaker-- and energy damage), the Retriever (five attacks and Improved Grab-- not as many as a 10HD hydra, but better Str, Dex, and NA) and possibly the Marut (just for brute Strength).

[cru]

These spells do not have the Polymorph Subschool, but unlike the Polymorph spell, the only let you assume the form and very specific abilities of a creature.

New polymorph like spells from Spell Compendium:

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ASPECT OF THE EARTH HUNTER
Transmutation
Level: Druid 6, ranger 4
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 minutes/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a bulette (MM 30). While under the effect of the spell, your creature type changes to magical beast, and your size changes to Huge. You have the space and reach of a bulette (XX feet/XX feet). You gain the Strength, Dexterity, and Constitution of an average bulette (Str XX, Dex XX, Con XX), but you retain your own mental ability scores. Your base land speed becomes XX feet, and you gain a burrow speed of XX feet. You gain darkvision out to XX feet. You also gain low-light vision, scent, and tremorsense out to XX feet.
Your class and level, hit points, alignment, base attack bonus, and base saving throw bonuses all remain the same. You lose any extraordinary special abilities of your own form, as well as spell-like and supernatural abilities. You keep all extraordinary special attacks derived from class levels (such as a barbarian's rage or a rogue's sneak attack), but you lose any from your normal form that are not derived from class levels. You cannot speak or cast spells while in bulette form. However, if you have the Natural Spell feat, you can cast spells normally.
Your natural armor bonus becomes +XX, regardless of any natural armor bonus from your normal form. You can make two claw attacks, which are natural weapons that deal 2d8+8 points of damage. While in bulette form, you gain the bulette's leap extraordinary attack form, allowing you to make four claw attacks instead of two. Your equipment melds into your new form and becomes nonfunctional.

ASPECT OF THE WOLF
Transmutation
Level: Druid 1, ranger 1
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 minutes/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a wolf (MM 283). (the rest of the text spells out exactly what you do and don't get)

BODY OF WAR
Transmutation
Level: Sorcerer/wizard 7
Casting Time : 1 standard action
Range: Personal
Target: You
Duration: 1 round/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a warforged titan (Eberron Campaign Setting 302). (the rest of the text spells out exactly what you do and don't get)

DISPLACER FORM
Transmutation
Level: Sorcerer/wizard 4
Casting Time : 1 standard action
Range: Personal
Target: You
Duration: 1 round/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a displacer beast (MM 66). (the rest of the text spells out exactly what you do and don't get)

HOLY TRANSFORMATION
Transmutation [Good]
Level: Cleric 7
This spell functions like lesser holy transformation, but when you cast this spell, you assume the physical appearance and many of the qualities and abilities of a hound archon (MM 16). While under the effect of the spell, your creature type changes to outsider (archon, good, lawful), and your size changes to Medium. You have the space and reach of a hound archon (X feet/X feet). You gain a +X sacred bonus to Strength and Constitution. You gain darkvision out to XX feet. You gain a +X sacred bonus on saving throws. You gain damage reduction X/evil. Evil creatures within XX feet of you take a –X penalty on attack rolls and saving throws. You gain the ability to speak and understand Celestial.

HOLY TRANSFORMATION, LESSER
Transmutation [Good]
Level: Cleric 4
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 round/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a protectar (Miniatures Handbook 66). (the rest of the text spells out exactly what you do and don't get)

INFERNAL TRANSFORMATION
Transmutation [Evil]
Level: Cleric 7
This spell functions like lesser infernal transformation, except when you cast this spell, you assume the physical appearance and many of the qualities and abilities of a bone devil (MM 52). (the rest of the text spells out exactly what you do and don't get)

INFERNAL TRANSFORMATION, LESSER
Transmutation [Evil]
Level: Cleric 4
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 round/level (D)
When you cast this spell, you assume the physical appearance and many of the qualities and abilities of a bearded devil (MM 52). (the rest of the text spells out exactly what you do and don't get)

PRIMAL FORM
Transmutation
Level: Druid 3, sorcerer/wizard 3
Casting Time : 1 standard action
Range: Personal
Target: You
Duration: 1 minute/level (D)
When you cast this spell, choose an element (air, earth, fire, or water). You assume the physical appearance and many of the qualities and abilities of a Medium elemental of the chosen element (MM 96–100) (the rest of the text spells out exactly what you do and don't get)

[cru]

Compared to the Polymorph spell, these have had their target changed to only the caster, duration changed to rounds/level (instead of minutes/level) but they are also now Swift Action to cast.
Casting Time: 1 swift action
Range: Personal
Target: You
Duration: 1 round/level (D)

And because of the Polymorph subschool, you lose your spell casting class feature!

Polymorph subschool text from Complete Mage

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A feature introduced in Player's Handbook II and further developed in this book is the polymorph subschool, which is defined and explained below.
A spell of the polymorph subschool changes the target's form from one shape to another. Unless stated otherwise in the spell's description, the target of a polymorph spell takes on all the statistics and special abilities of an average member of the new form in place of its own except as follows:
• The target retains its own alignment (and personality, within the limits of the new form's ability scores).
• The target retains its own hit points. The target is treated has having its normal Hit Dice for purpose of adjudicating effects based on HD, such as the sleep spell, though it uses the new form's base attack bonus, base save bonuses, and all other statistics derived from Hit Dice.
• The target retains the ability to understand the languages it understands in its normal form. If the new form is normally capable of speech, the target retains the ability to speak these languages as well. It can write in the languages it understands, but only if the new form is capable of writing in some manner (even a primitive manner, such as drawing in the dirt with a paw).
In all other ways, the target's normal game statistics are effectively replaced by those of the new form. The target loses all of the special abilities it has in its normal form, including its class features (even if the new form would normally be able to use these class features).
If the new form's size is different from the target's normal size, its new space must share as much of the original form's space as possible, squeezing into the available space (PH 148) if necessary. If insufficient space exists for the new form, the spell fails.
Any gear worn or carried by the target melds into the new form and becomes nonfunctional. When the target reverts to its true form, any objects previously melded into the new form reappear in the same location on its body they previously occupied and are once again functional. Any new items worn in the assumed form fall off and land at the target's feet.
The spellcaster can freely designate the new form's minor physical qualities (such as hair color and skin color) within the normal ranges for a creature of that kind. The new form's significant physical qualities (such as height, weight, and gender) are also under the spellcaster's control, but they must fall within the norms for the new form's kind. The target of a polymorph spell is effectively camouflaged as a creature of its new form, and gains a +10 bonus on Disguise checks if it uses this ability to create a disguise.
If the target of a polymorph spell is slain or rendered unconscious, the spell ends. Any part of the body that is separated from the whole remains polymorphed until the effect ends.
Incorporeal or gaseous creatures are immune to polymorph spells, as are creatures of the plant type. A creature with the shapechanger subtype (such as a lycanthrope or doppelganger) can revert to its natural form as a standard action.

Polymorph subschool spells from Complete Mage:

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ASPECT OF THE ICY HUNTER
Transmutation (Polymorph)
Level: Sorcerer/wizard 4
You take the form of a winter wolf (MM 256). You gain 20 temporary hit points, which disappear at the end of the spell's duration. See the Polymorph Subschool sidebar on page 91 for more details.

DREADED FORM OF THE EYE TYRANT
Transmutation (Polymorph)
Level: Sorcerer/wizard 8
You take the form of a beholder (MM 26). You gain 30 temporary hit points, which disappear at the end of the spell's duration. You can use only one eye ray each round, and each of your ten eye rays can be used only once during the spell's duration. For example, once you use your disintegrate eye ray, you can't use that eye ray again during this casting of the spell. See the Polymorph Subschool sidebar on page 91 for more details.

FORM OF THE THREEFOLD BEAST
Transmutation (Polymorph)
Level: Sorcerer/wizard 5
You take the form of a chimera (MM 34); choose the color of your dragon head from the options noted in the monster description when you cast the spell. You gain 30 temporary hit points, which disappear at the end of the spell's duration. See the Polymorph Subschool sidebar on page 91 for more details.

SHAPE OF THE HELLSPAWNED STALKER
Transmutation (Polymorph)
Level: Sorcerer/wizard 3
You take the form of a hell hound (MM 151). You gain 10 temporary hit points, which disappear at the end of the spell's duration. See the Polymorph Subschool sidebar on page 91 for more details.

UNYIELDING FORM OF INEVITABLE DEATH
Transmutation (Polymorph)
Level: Sorcerer/wizard 8
You take the form of a marut (MM 159), including the full plate armor normally worn by such a creature. You gain 50 temporary hit points, which disappear at the end of the spell's duration. You can use each of the marut's at-will spell-like abilities (such as dimension door) once per casting of the spell, but you don't gain access to any of the marut's 1/day or 1/week spell-like abilities (such as chain lightning or earthquake). See the Polymorph Subschool sidebar on page 91 for more details.

Polymorph subschool spells from Players Handbook II:

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Dragonshape
Transmutation (Polymorph)
Level: Sorcerer/wizard 9
You take the form of a mature adult red dragon (see below). You gain 150 temporary hit points, which disappear at the end of the spell's duration. You do not gain the normal spell casting ability of your new form. See the Polymorph Subschool sidebar on page 95 for more details.

Trollshape
Transmutation (Polymorph)
Level: Sorcerer/wizard 4
You take on the form and abilities of a Troll (MM 247). You gain 30 temporary hit points, which disappear at the end of the spell's duration. See the Polymorph Subschool sidebar on page 95 for more details.

Polymorph subschool spells from Dragon Magic:

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ASPECT OF THE CHROMATIC DRAGON - Level: Sorcerer 8 - aspect of tiamat
ASPECT OF THE PLATINUM DRAGON - Level: Sorcerer 7 - aspect of bahamut
DRAGONSHAPE, LEAST - Level: Sorcerer/wizard 3 - tiny pseudodragon
DRAGONSHAPE, LESSER - Level: Sorcerer/wizard 6 - large young red dragon
FORM OF THE DESERT HUNTER - Level: Sorcerer/wizard 5 - dragonne

Polymorph subschool spells from Drow of the Underdark:

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DRIDERSHAPE - Level: Sorcerer/wizard 5 - drider
SPIDER FORM - Level: Sorcerer/wizard 3 - large fiendish monstrous spider (MM 289)
SPIDER FORM, GREATER - Level: Sorcerer/wizard 5 - huge fiendish monstrous spider (MM 289)
SPIDER FORM, LESSER - Level: Sorcerer/wizard 1 - medium fiendish monstrous spider (MM 289)

Polymorph subschool spells from Complete Scoundrel:

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Aquatic Escape - Level: Druid 1 - diminutive fish
Winged Watcher - Level: Druid 1 - owl or raven

[cru]

Outsider races:

• LA+0 race - Neraphim from Planar Handbook (p. 12)
• LA+0 race + Otherworldly feat from Player's Guide to Faerun (p. 41)
• +0 LA Non-Humanoids
• Player Race List with LA +1 and LA +2 

Spells that make you outsider temporarily

• As the Frost (PH2) - Druid 7, sorcerer/wizard 7 (rounds/level)
• Devil's Ego (FC2) - diabolic domain 3rd level (minutes/level)
• Fiendform (SpC) 5th level Sorcerer/wizard spell (minutes/level)
• Holy transformation, lesser (SpC) 4th level Cleric spell (rounds/level)
• Infernal transformation, lesser (SpC) 4th level Cleric spell (rounds/level)

Useful Feats

• Assume Supernatural Ability (Savage Species): You learn to use a supernatural ability of an assumed form.
• Assume Supernatural Ability, Improved (Savage Species): You gain skill with using a supernatural ability of an assumed form.
• Metamorphic Transfer: You can gain a supernatural ability of a metamorphed form.
• Minor Shapeshift (Complete Mage): Grant physical benefits, +1 Caster Level on polymorph spells
• Reserves of Strength (DLCS p. 86): can exceed caster level cap by 3

Useful Spells

• Miracle: Clerics can use this to cast Polymorph Any Object because it's on the Trickery domain list as an 8th level spell.
• Draconic Might (Spell Compendium p.72) provides +4 enhancement bonus to Str, Con and Cha and a +4 to Natural Armor

Useful Items

• sizing weapon

Alternative ways of gaining polymorph

• invocation: spider shape (dotu) - lesser, 3rd - has the polymorph subschool
• invocation: hellspawned grace (CM) - greater, 6th - has the polymorph subschool - hellcat
• PRC: Eye of Lolth adaptation (DotU) - elves/halfelves gain disguise self, alter self, polymorph, each cha bonus / day
• item: Cape of the viper (2k, MIC) - polymorph subschool effect, change into viper
• item: Cloak of the bat (26k, DMG) - polymorph into a bat at will
• item: Mantle of Breland (15k, Forge of War) - polymorph subschool effect, change into brown bear
• item: Nightshard maul (52305, PGtE) - 1/day polymorph at CL7
• item: Ring of dragonshape (23k, draconomicon) - 1/day polymorph into young red or gold dragon for 1 hour
• item: Skin of Proteus (84k) - metamorphosis at ML7

Misc

• Paragnostic Apostle (PRC, CC) - can select Mortal Coil: +1 CL for spells like polymorph
• Master Transmogrifist (PRC, CArc) - various polymorph-related benefits
• Warshaper (PRC, CW) - ability to cast polymorph allows you to qualify for this prestige class

[Endarire]

The Realmshelp creature links don't work due to link reformatting/database restructuring, but this is a list of their creatures.