Certain skills against your favored enemies improve.
Prerequisites: Five or more favored enemies.
Benefit: Add +1 to the bonus on Bluff, Listen, Sense Motive, Spot, and Survival checks and damage rolls against all your favored enemies.
Special: This feat may be taken multiple times. Its effects stack.
Source: Dungeon Master’s Guide (version 3.5), page 210. Originally named Improved Favored Enemy but Complete Warrior added a non-epic feat of the same name, so this feat was renamed Epic Favored Enemy to disambiguate it.