Source: Epic Level Handbook
When in combat, your form becomes blurry and indistinct, making it difficult to land a blow against you.
Prerequisite: Dex 30, Hide 30 ranks, Tumble 30 ranks, improved evasion
Benefit: Attacks against you have a 10% miss chance (the equivalent of one-quarter concealment). You lose this benefit whenever you would lose your Dexterity bonus to AC.
Special: This feat may be taken multiple times. Each time it is taken, the miss chance increases by 10% to maximum of 50% after it has been taken five times.