Great Smiting

 
Prerequisite(s): 21+ Character level, Cha 25+, Smite Ability (from class feature or domain granted power).
 
Benefit: Whenever the character makes a successful smite attack, add twice the appropriate level to damage (rather than just the character’s level).
 
Special: A character may select this feat multiple times. Its effects stack. Remember that two doublings equals a tripling, and so forth.
 
Source: Dungeon Master's Guide, Epic Level Handbook