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PFS StandardThunderclap Spell [one-action] Feat 10

Druid Sonic Spellshape 
Source Player Core pg. 133 2.0
Prerequisites storm order

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.

Traits

Sonic:

An effect with the sonic trait functions only if it makes sound, meaning it has no effect in an area of silence or in a vacuum. This is different from an auditory spell, which is effective only if the target can hear it. A sonic effect might deal sonic damage. A creature with this trait has a magical connection to powerful sound.

Spellshape:

Actions with the spellshape trait tweak the properties of your spells. You must use a spellshape action directly before casting the spell you want to alter. If you use any action (including free actions and reactions) other than casting a spell directly after, you waste the benefits of the spellshape action. Any additional effects added by a spellshape action are part of the spell's effect, not of the spellshape action itself.