Energy Substitution( Deities and Demigods, p. 50)
The deity can modify a spell that uses energy to use another type of energy.
Knowledge (arcana) 5 ranks, Any other metamagic feat,
The deity chooses one type of energy: acid, cold, electricity, fire, or sonic. When employing a spell with the acid, cold, electricity, fire, or sonic designator, it can modify the spell to use its chosen type of energy instead. The altered spell uses a spell slot of the spell's normal level.
The altered spell works normally in all respects except the type of damage dealt. For example, a fireball spell changed to a sonicball spell works like a fireball, but deals sonic damage instead of fire damage.
A deity can gain this feat multiple times. Each time the feat applies to a different type of energy.