What sources are allowed and what levels are you likely playing at?
A quick note, which it seems you may have missed, I'm the DM, so this is an NPC. It is a 20th level NPC. Pretty much everything is allowed except subsystems (incarnum, psionics, ToB, etc).
Is Elf on the table? Half elf has very little to offer as a race to such a character.
It must be human or half elf. Since I'm intending to putter around with Imbue Arrow, it needs to be a half-elf.
Since it takes a standard action to fire the arrow, extra standard actions will probably help.
Not a problem; this game allows what is basically 3.0 Haste as a 5th level spell.
Here's what I've worked up so far, though I'm still lacking a lot of area spells for Imbue Arrow. I also need to pick several feats.
Half-Elf Wizard 19/Mindbender 1//Ranger 6/Duskblade 3/Fighter 2/Arcane Archer 9
Medium Humanoid (elf)
Hit Dice: 18d8 + 2d10 + 40 (159 hp)
Initiative: +6
Speed: 30 ft. (6 squares)
Armor Class: 20 (+6 Dex, +4 Mage Armor), touch 16, flat-footed 14
Base Attack/Grapple: +20/+23
Attack: MW Longsword +24 melee (1d8+3) or +5 Seeking Splitting Comp Longbow +31/+31 ranged (1d8+8)
Full Attack: +5 Seeking Splitting Comp Longbow +31/+31/+26/+26/+21/+21/+16/+16 ranged (1d8+8)
Rapid Shot: +5 Seeking Splitting Comp Longbow +29/+29/+29/+29/+24/+24/+19/+19/+14/+14 ranged (1d8+8)
Space/Reach: 5 ft./5 ft.
Special Attacks: Spells, Favored Enemy (Humans +4, Giants +2), Arcane Channeling, enhance arrow +5, imbue arrow, seeker arrow, phase arrow, hail of arrows
Special Qualities: Low-light vision, wild empathy, animal companion, armored mage, arcane attunement
Saves: Fort +19, Ref +18, Will +13
Abilities: Str 16 [10], Dex 22 [16], Con 14, Int 32 [26], Wis 11, Cha 8
Skills: Bluff +4 [1+4 cc], Concentration +25 [23], Diplomacy +5 [4 cc], Hide +29 [23], Intimidate +5 [4 cc], Kn (Arcana) +16 [5], Listen +23 [23], Move Silently +29 [23], Sense Motive +4 [4], Spellcraft +34 [23], Spot +23 [23], Survival +17 [15]; 210 skill points total (24 remaining)
Feats: Scribe Scroll*, Track*, Point Blank Shot, Rapid Shot*, Endurance*, Precise Shot, Weapon Focus (longbow), Manyshot*, Combat Casting*, Sudden Extend, 12, 15, Sudden Silent Spell, Sudden Still Spell, Quicken Spell, F1, F2, Mindsight
Environment: Any
Organization: Solitary
Challenge Rating: [GCR 20]
Treasure: Standard
Alignment: Neutral evil
Advancement: By character class
Level Adjustment: +0
Spells: Wizard caster level 20th; save DC 21+spell level.
Spells per day (4/7/7/7/6/6/6/6/5/5);
0–light, mage hand, mending, mending
1st–mage armor, shield, magic missile, magic missile, feather fall, arrow mind, nerveskitter
2nd–heart of air, scintillating scales, wraithstrike, scorching ray, glitterdust, ?, ?
3rd–heart of water, slow, fly, vampiric touch, displacement, protection from energy, phantom steed
4th–heart of earth, greater mirror image, dimension door, solid fog, ?, ?
5th–heart of fire, true haste, true haste, teleport, xorn movement, cloud kill, ?
6th–antimagic field, antimagic field, greater dispel magic, true seeing, greater anticipate teleport, ?
7th–limited wish, ethereal jaunt, project image, Quickened slow, ?, ?
8th–mind blank, maze, sunburst, superior invisibility, mystic shield
9th–shapechange, Mordenkainen's disjunction, time stop, time stop, frostfell
Other spells active: permanent arcane sight, contingency (dimension door; triggered by casting nerveskitter)
Ranger caster level 3rd; save DC 10+ spell level; Spells per Day (1)
1st–hunter's mercy
Wand of Brilliant Energy Arrow (40 charges)
Tome of Intelligence +3, Headband of Intellect +6, Gloves of Dex +6, Belt of Giant Strength +6
+1 Seeking Splitting Composite Longbow
Shapechanged form:
FLOKI STANSSON - Pit Fiend Shapechange
Half-Elf Wizard 19/Mindbender 1//Ranger 6/Duskblade 3/Fighter 2/Arcane Archer 9
Medium Humanoid (elf)
Hit Dice: 18d8 + 2d10 + 40 (159 hp)
Initiative: +6
Speed: 40 ft. (8 squares), fly 60 ft. (12 squares)
Armor Class: 47 (-1 size, +11 Dex, +23 natural, +4 Mage Armor), touch 20, flat-footed 36
Base Attack/Grapple: +20/+40
Attack: MW Longsword +36 melee (2d6+16) or +5 Seeking Splitting Comp Longbow +36/+36 ranged (2d6+8)
Full Attack: +5 Seeking Splitting Comp Longbow +36/+36/+31/+31/+26/+26/+21/+21 ranged (2d6+8) and
2 wings +30 melee (2d6+8) and bite +30 melee (4d6+8 plus poison plus disease) and tail slap +30 melee (2d8+8)
Rapid Shot: +5 Seeking Splitting Comp Longbow +34/+34/+34/+34/+29/+29/+24/+24/+19/+19 ranged (1d8+8)
Space/Reach: 10 ft./10 ft.
Special Attacks: Spells, Favored Enemy (Humans +4, Giants +2), Arcane Channeling, enhance arrow +5, imbue arrow, seeker arrow, phase arrow, hail of arrows; improved grab, constrict, disease, fear aura, poison
Special Qualities: DR 15/Good and Silver, Darkvision, immunity to fire and poison, resist acid 10, cold 10, regeneration 5, see in darkness, SR 32; wild empathy, animal companion, armored mage, arcane attunement, telepathy 100 ft.
Saves: Fort +25, Ref +23, Will +13
Abilities: Str 43 [37], Dex 33 [27], Con 27, Int 32 [26], Wis 11, Cha 8
Skills: Bluff +X [1+4 cc], Concentration +X [23], Diplomacy +X [4 cc], Hide +X [23], Intimidate +X [4 cc], Kn (Arcana) +X [5], Listen +X [23], Move Silently +X [23], Sense Motive +X [4], Spellcraft +X [23], Spot +X [23], Survival +17 [15]; 210 skill points total (24 remaining)
Feats: Scribe Scroll*, Track*, Point Blank Shot, Rapid Shot*, Endurance*, Precise Shot, Weapon Focus (longbow), Manyshot*, Combat Casting*, Sudden Extend, 12, 15, Sudden Silent Spell, Sudden Still Spell, Quicken Spell, F1, F2, Mindsight
Environment: Any
Organization: Solitary
Challenge Rating: [GCR 20]
Treasure: Standard
Alignment: Neutral evil
Advancement: By character class
Level Adjustment: +0
Spells: Wizard caster level 20th; save DC 21+spell level.
Spells per day (4/7/7/7/6/6/6/6/5/5);
0–light, mage hand, mending, mending
1st–mage armor, shield, magic missile, magic missile, feather fall, arrow mind, nerveskitter
2nd–heart of air, scintillating scales, wraithstrike, scorching ray, glitterdust, ?, ?
3rd–heart of water, slow, fly, vampiric touch, displacement, protection from energy, phantom steed
4th–heart of earth, greater mirror image, dimension door, solid fog, ?, ?
5th–heart of fire, true haste, true haste, teleport, xorn movement, cloud kill, ?
6th–antimagic field, antimagic field, greater dispel magic, true seeing, greater anticipate teleport, ?
7th–limited wish, ethereal jaunt, project image, Quickened slow, ?, ?
8th–mind blank, maze, sunburst, superior invisibility, mystic shield
9th–shapechange, Mordenkainen's disjunction, time stop, time stop, frostfell
Other spells active: permanent arcane sight, contingency (dimension door; triggered by casting nerveskitter)
Ranger caster level 3rd; save DC 10+ spell level; Spells per Day (1)
1st–hunter's mercy
Wand of Brilliant Energy Arrow (40 charges)
Tome of Intelligence +3, Headband of Intellect +6, Gloves of Dex +6, Belt of Giant Strength +6
+1 Seeking Splitting Composite Longbow
Spellbook also contains Charm person,
Constrict (Ex): A pit fiend deals 2d8+26 points of damage with a successful grapple check.
Disease (Su): A creature struck by a pit fiend’s bite attack must succeed on a DC 27 Fortitude save or be infected with a vile disease known as devil chills (incubation period 1d4 days, damage 1d4 Str). The save DC is Constitution-based.
Fear Aura (Su): A pit fiend can radiate a 20-foot-radius fear aura as a free action. A creature in the area must succeed on a DC 18 Will save or be affected as though by a fear spell (caster level 18th). A creature that successfully saves cannot be affected again by the same pit fiend’s aura for 24 hours. Other baatezu are immune to the aura. The save DC is Charisma-based.
Improved Grab (Ex): To use this ability, a pit fiend must hit with its tail slap attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can constrict.
Poison (Ex): Injury, Fortitude DC 27, initial damage 1d6 Con, secondary damage death. The save DC is Constitution-based.
Regeneration (Ex): A pit fiend takes normal damage from good-aligned silvered weapons, and from spells or effects with the good descriptor.