Prerequisite: Base attack bonus +1.
Benefits:
Special: This feat can be taken five times and bonuses stack.
Base attack bonus +1: 1st favored enemy. Base attack bonus +5: 2nd favored enemy. Base attack bonus +10: 3rd favored enemy. Base attack bonus +15: 4th favored enemy. Base attack bonus +20: 5th favored enemy.
Ranger: 1st, 5th, 10th, 15th, and 20th level.
Paladin Variant: as above, but limited to certain enemies, and lose lay on hands, turn undead, and remove disease.