Type: Epic, Vile
Source: Web
Your smite attack channels especially potent evil power.
Prerequisite: Cha 25, evil alignment, smite ability (from class feature or domain granted power), Power Attack, Unholy Strike, Vile Martial Strike (or Vile Ki Strike or Vile Natural Attack).
Benefit: All extra damage inflicted by your smite attack is considered vile damage (see the Book of Vile Darkness).