From Pathfinder Lost Omens Cheliax, Infernal Inheritance, which isn't enabled.

Fiend Worshipper

FEAT 1

Prerequisites You have a fiendish patron deity; you are not holy

You seek greater power through unholy communion, amplifying your sadism into something supernaturally evil. You are sanctified as unholy. Your strikes against frightened creatures deal 1 additional mental damage with the unholy trait.

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC