feat Subdual Substitution

Subdual Substitution (Metamagic)

You can modify a spell that uses energy to deal damage to deal subdual damage instead.

(Tome and Blood: A Guidebook to Wizards and Sorcerers, p. 42)
Originally posted on D&Dtools

Prerequisite Knowledge (arcana) 5 ranks, Any other metamagic feat,
Benefit Choose one type of energy: acid, cold, electricity, fire, or sonic. You can modify a spell with the chosen designator to inflict subdual damage instead of energy damage. The subdual spell works normally in all respects except the type of damage dealt. For example, a subdual fireball spell works in the usual way, but the subdual fireball deals subdual damage instead of fire damage. A subdual spell uses a spell slot of the spell’s normal level, modified by any other metamagic feats.