Darius Lawbringer CR 8
Male Aasimar Ex-Paladin 2/Paladin of Tyranny 4
LE Medium Aberration
Init +2, Senses Listen +3; Spot +3; darkvision 60 ft.
Aura Aura of Evil, Aura of Despair (10 ft.)
Languages celestial, common
AC 17, touch 8, flat-footed 17 (-2 dex, +6 armor, +3 shield)
hp 55 (6d10+24 HD); DR 5/magic
Immune acid, disease; Resist acid 5, cold 5, electricity 5
Fort +13, Ref +1, Will +1
Fast healing 3
Spd 20 ft. (4 squares)
Melee +1 bastard sword +13/+8 (1d10+5/19-20x2)
Ranged Mwk comp longbow +5/+0 (1d8+4/x3 - 110 ft.)
Base Atk +6; Grp +10
Space 5 ft.; Reach 5 ft.
Atk Options smite good (+2 atk, +4 dmg) 1/day, deadly touch (melee touch +8, 4 dmg, Will DC 18 for half), disruptive attack (melee touch +8, 3 vile damage), power attack (-5 atk, +5 dmg)
Combat Gear potion of bear's endurance, potion of bull's strength
Special Actions rebuke undead 4/day
Spell-like Abilities (CL 2): detect good at will
Abilities Str 19 (+4), Dex 6 (-2), Con 18 (+4), Int 10 (+0), Wis 12 (+1), Cha 14 (+2)
SQ divine grace, divine health
Feats exotic weapon proficiency (bastard sword), weapon focus (bastard sword), power attack, improved initiative
Skills handle animal +11, ride +10
Possessions +1 breastplate, +1 heavy steel shield, +1 bastard sword, masterwork composite (+4 Str) longbow with 20 arrows, leather pouch with 1d6 platinum pieces and 1d8 gold pieces
Paladin of Tyranny variant from Unearthed Arcana. The weak will flaw is also from Unearthed Arcana.
Note: Technically, according to the rules for Corrupt creatures from the Book of Vile Darkness, Aasimars cannot be Corrupted because they are Outsiders. However, I felt that this was a reasonable exception to that rule, and it fits very well with the character idea as well.
Darius has reached the final stage of corruption, having been fully convinced by the banished devil that the gods of justice and righteousness have abandoned him. Now he is seeking his revenge, and plans to do whatever it takes to get "true justice."