Sirene Primer+Free Or Non Actions+Tension_Abilities+Fiery_Offense_1

For each tension a striker spends on this tension technique, she gains a +1 circumstance bonus to attack and damage rolls made with unarmed strikes until the beginning of her next turn.

Lasting Flame (Ex)
The circumstance bonus on attack and damage rolls granted by the striker’s fiery offense tension technique now lasts until the end of her next turn.