Requirement: Perform 5 ranks
Base effect: All enemies within 30 feet that are maintaining or initiating a performance-based ability (such as maestro performance or bardic performance) must make an opposed Perform check against you. Success means they can initiate or maintain their performance as normal, failure means they instantly interrupt their performance, wasting the round of performance for the day. For every 5 points by which their result is lower than yours, they lose one additional round of performance for the day. If they win the opposed check, they must not attempt another check to maintain their performance, but they must attempt a new one if they stop performing and begin again.
You attack with a ray of pure sonic force. Make a ranged touch attack against one creature within medium range that you can see, on a successful attack, it suffers sonic damage. This refrain is a supernatural ability.
Weak Refrain: the target suffers 1d4 points of damage per siren level (max 5d4).
Intermediate Refrain: the target suffers 1d6 points of damage per siren level (max 10d6).
Strong refrain: the target suffers 1d8 points of damage per siren level (max 15d8).