You can manipulate the elemental nature of your spells.
Benefit: Choose one energy type: acid, cold, electricity, or fire. You may replace a spell’s normal damage with that energy type or split the spell’s damage, so that half is of that energy type and half is of its normal type.
Level Increase: +1 (an elemental spell uses up a spell slot one level higher than the spell’s actual level.)
Special: You can gain this feat multiple times. Each time you must choose a different energy type.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.