SRD:Energy Resistance (Feat)
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Energy Resistance [Epic]
Choose a type of energy (acid, cold, electricity, fire, or sonic). The character gains resistance 10 to that type of energy, or the character’s existing resistance to that type of energy increases by 10. This feat does not stack with energy resistance granted by magic items or nonpermanent magical effects.
A character can gain this feat multiple times. If the same type of energy is chosen, the effects stack.