Purify Spell

 
Prerequisite(s): Any Good alignment
 
Benefit: Any spell modified by this feat gains the good descriptor. Neutral creatures take 1/2 damage (1/4 if they save), Evil outsiders take extra damage from spells prepared this way: Basr d6 becomes base d8, etc. Purified spells take a spell slot one level higher than normal.
 
Source: Book of Exalted Deeds