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There is a Legacy version here.

PFS StandardGruesome Strike [one-action] Feat 12

Champion 
Source Player Core 2 pg. 98
Prerequisites champion’s reaction that grants extra damage with your Strikes (including the desecration, iniquity, and obedience causes)
Requirements Your Strikes currently deal extra damage from your champion’s reaction.

Make a Strike against the creature that triggered your champion's reaction. If you hit, double the extra damage the target takes from your reaction, and the target must succeed at a Fortitude save against your class DC or be drained 1. Regardless of the result, the creature is temporarily immune to your Gruesome Strike for 24 hours.