Feat: Thunderclap Spell

Your lightning splits the air, generating a booming shock wave. If your next action is to Cast a Spell that has the electricity trait or deals electricity damage, has no duration, and requires creatures to attempt a saving throw, the force of the spell's lightning creates a thunderclap, in addition to its other effects. Each creature that failed its Reflex save against the spell is Deafened for 1 round, and those who critically failed are also knocked Prone.