Awakened Constructs or Effigies pumped full of HD for loads of bonus feats. Do a 12 headed hydra.
Craft an Effigy of a heavily template stacked version of a monster. Like this Gold Dragon. I've done this epic artificer stuff with a whole army of fun stuff
--Corrupted Creature (BoVD 186): Apply: Any corporeal creature // Change: Aberration
--Half Troll (Fiend Folio 93): Apply: Animal,Dragon,Fey,Giant,humanoid,magicalbeast,monstroushumanoid,outside // Change: Giant
--Shadow Creature (LoM 168): Apply: Any but construct // Change: None (For the move speed+)
--Earth Element (MotP 193): Apply: Aberration,Animal,Beast,MagicBeast,Plant,Vermin // Change: Elemental(Earth)
--Spellwarped??? (MM3 163): Apply: Any but construct,outsider // Change: Aberration
--Multiheaded??? (SS 125): Apply: Anything with a head // Change: None
--Winged??? (SS 138): Apply: Animal,Giant,Humanoid,MonstrousHumanoid,Vermin // Change: None
--Half Dragon (MM 147): Apply: Any living corporeal creature // Change: Dragon
Progression/Changes:
Dragon->(1)Giant->(2)Giant->(3)Giant->(4)Aberration->(5)Aberration->(6)Elemental(Earth)->(7)Dragon->(8)Dragon->(9)Construct
1)Half Troll: Nat AC+4, Rend 4d8+1.5x Str, Str+6 Dex+2 Con+6 Int-2 Cha-2, CR+2
2)Winged: Fly Speed=Land+20/17+dex=Perfect Maneuverability Dex+4 Wis+2, CR+1
3)Shadow Creature: All Speeds x1.5, +6 Move silently, CR+1
4)Corrupted: Nat AC+8, Natural attacks+1 die size, Str+4 Dex-2 Con+4 Wis-2 Cha-2, CR+3
5)Spellwarped: Nat AC+2, Str+4 Dex+2 Con+4 Int+4, CR+2
6)
7)Half Dragon(Black): Nat AC+4, Str+8 Con+2 Int+2 Cha+2, CR+2
8)Multiheaded: +3 heads, All attacks are primary, +1NatAC/Head(+3), +6Spot/Listen/Search, Improved Initiative, Combat Reflexes, CR+5
9)Effigy: NatAC+2, Str+4 Dex-2 Con=(-) Int=(-) Wis=11 Cha=1, CR+1
10)Awakened Construct: Int=14 Wis=13 Cha=15
Base Gold Dragon Stats:
41d12+451 (717 hp)
Size AC: -8
Nat AC: +40
Total AC: 42 (10+0Dex+40Nat-8Size)
Touch AC: 2 (10-8Size+0Dex)
Flatfooted AC: 42 (10+40Nat-8Size)
Str: 47
Dex: 10
Con: 33
Int: 32
Wis: 33
Cha: 32
Fort: 33
Reflex: 22
Will: 33
Land Speed: 60
Fly Speed: 250
Swim Speed: 60
CR: 27
NEW STATS:
33d10+80 (410 hp)
DR: 50/Adamantine
SR: 42
Size AC:-8
Nat AC: +63
Total AC: 67 (10+2Dex+63Nat-8Size)
Touch AC: 4 (10+2Dex-8Size)
Flatfooted AC: 65 (10+63Nat-8Size)
Str: 73 (+31)
Dex: 14 (+2)
Con: (-)
Int: 14 (+2)
Wis: 13 (+1)
Cha: 15 (+2)
Saves: +1/3HD
Fort: +13 (Base11+0Con+2Impr.)
Reflex: +15 (Base11+2Dex+2Impr.)
Will: +12 (Base11+1Wis+2Impr.)
Land Speed: 90ft
Fly Speed: 375ft (Perfect)
Swim Speed: 90ft
Burrow Speed: 30ft
Improved Effigy: +2 hit, dmg, saves
BAB: +24
Grapple: +75 (BAB24+31Str+20Size)
Melee: +62 (BAB24+31Str+2Impr.+5MagicFang)
Bite: +62 (8d8+55)
x2 Claw: +62 (8d6+23) ->Can Rend on both hit: 6d8+55
x2 Wing: +62 (4d8+23)
Tail Slap: +62 (8d6+55)
x3 Extra Heads: +62 (8d8+55 each)
Dive option: If dive from above with charge, double claw damage
Shattermantle (All attacks): -2 SR per hit for 1/round
Whirling(Tail): Whirlwind Attack with Tail
Feats:
Improved Natural Attack (Bite,Claw,Wing,Tail)
Snatch (AutoGrappleClaw: Medium or smaller // AutoGrappleBite: Large or smaller // Auto damage)
Power Attack
Improved Bull Rush (Bullrush total= +26 (+46 with size counted))
Awesome Blow (Reflex DC=Damage, thrown 10ft & knocked prone)
Powerful Charge+Greater (+8d6 on charge)
Hover
Reinforced Wings (Fly with medium load)
Features (Magical, built in, Temporarily Dispellable, CL30)
Blueshine: Immune to Acid and Rust effects (Not Dispellable)
Displacement: 50% miss chance, Permanent
Fire Shield: 1d6+15 Fire or Cold damage to attacker
Freedom of Movement: Permanent
Greater Magic Fang: +5 to hit and damage to all natural attacks, Permanent
Skills:
Climb: +40
Tumble: +19
Decipher Script: +20
Spellcraft: +14
Know. Geography: +12
Speak Language: +14 (All languages known)
Search: +20
Spot: +25
Listen: +25
CR: 44
A greater cadaver collector is a pretty cool construct. Autodamages grappled foes by pinning them to spikes on its back and has a paralyzing breath weapon.
If you have somebody that plays with undead minions, having a shadesteel golem is pretty cool as it has a negative energy damage aoe burst attack centered on itself.
Slaughterstone Behemoths can punch things to do Fort save or Daze (nothing is immune to Daze) and has an AoE stomp to trip.
Clockwork Mender Swarms are fantastic as repair drones.
If a DM is okay with it you can even enchant them with built in armor/weapon abilities. If not, you can still build into them permanent items (or slotless ones) with constant spell effects running for additional buffs to cover any weaknesses and enhance the strengths of your constructs. (Like putting a perm invis sphere on flying robots for transportation)
Nimblewrights are amazing dex/crit based combat constructs that excel in tripping.
You could also craft a bunch of intelligent weapons and give them their own mobility options. Have a bunch of AI controlled gun turrets floating around you at all times.
Abuse the hell out of craft cost reductions and see if you can apply them to crafting epic spells for mass robot army drops and/or recoveries that aren't easily stopped/prevented by Dispel Magic/Antimagic
Effigy Master certainly ain't worthless if you want to fight armies.