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PFS StandardResounding Finale [reaction] Feat 16

Bard Concentrate 
Source Player Core pg. 107
Prerequisites maestro muse
Trigger You or an ally benefiting from your composition spell would take sonic damage

You bring your performance to a sudden, dramatic finish, drowning out other sounds. Your composition spell ends immediately, and all allies that had been benefiting from the spell’s effects gain sonic resistance against the triggering damage equal to twice the composition spell’s rank.

Traits

Concentrate:

An action with this trait requires a degree of mental concentration and discipline.