Improved Favored Enemy
(Epic Level Handbook, page 58, DnD 3.0)
[General]
Prerequisite
Five or more favored enemies
Benefit
Add +1 to the bonus on Bluff, Listen, Sense Motive, Spot, and Wilderness Lore checks and damage rolls against all your favored enemies.
Special
This feat may be taken multiple times. Its effects stack.