Requirement: Perform 17 ranks
Base effect: You can make a special push combat maneuver check against each enemy that tries to approach you. When an enemy moves within 30 feet of you, you can push them back by making a Perform check, with DC equal to the CMD of the enemy. If you are successful, the enemy is pushed back according to the result and cannot make further movements towards you. Furthermore, all ranged attacks made against you take a –10 penalty.
You summon a blast of force surrounding you, dealing force damage to all creatures within 20 feet of your position. A successful Fortitude save halves the damage.
Weak Refrain: creatures in the area suffer 1d4 points of damage per siren level (max 10d4).
Intermediate Refrain: creatures in the area suffer 1d6 points of damage per siren level (max 20d6).
Strong refrain: creatures in the area suffer 1d6 points of damage per siren level (max 20d6) and are knocked prone. A successful saving throw negates the prone condition, but does not reduce the damage.