Energy Affinity

 
Prerequisite(s): Knowledge (arcana) 5+ ranks, able to cast at least one spell of each of these energy types: acid, and fire, cold, electricity.
 
Benefit: Choose acid, cold, electricity, or fire. You can modify any spell with an energy descriptor to use the chosen type of energy instead. A spell so modified works normally in all respects except the type of damage dealt. A modified spell uses a spell slot of the spell's normal level, modified by any other metamagic feats.
 
Special: You can gain this feat multiple times. Each time you take the feat, it applies to a different type of energy.
 
Source: Miniatures Handbook