Merciful Spell (Metamagic)Source Advanced Player's Guide pg. 165 Your damaging spells subdue rather than kill.
Benefit: You can alter spells that inflict damage to inflict nonlethal damage instead. Spells that inflict damage of a particular type (such as fire) inflict nonlethal damage of that same type. A merciful spell does not use up a higher-level spell slot than the spell’s actual level.
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