pf2e.fyi
From Pathfinder Howl of the Wild, which isn't enabled.

Alarming Disappearance

FEAT 5
Prerequisites expert in Stealth

Your ability to move unseen is startling for one your size, causing panic among your enemies. When you successfully Hide when previously observed, creatures you are Hidden from become Frightened 1. They are then temporarily immune to Alarming Disappearance for 1 hour. Typically, creatures that have traveled with you for a significant time, such as your fellow party members, are immune to your Alarming Disappearance.

Pathfinder Howl of the WildORC