pf2e.fyi
From Pathfinder Adventure: Night of the Gray Death, which isn't enabled.

Gardener's Resolve

FEAT 8
ARCHETYPEVIGILANTE
Activity reaction
Archetype Gray Gardener
Prerequisites Vigilante Dedication; Member of the Grey Gardeners
Frequency once per day
Trigger You roll a failure (but not a critical failure) on a Will save against a fear effect.

The Gray Gardeners are known for having nerves of steel and an unbreakable resolve. When you would be overwhelmed by terror, you can draw upon this resolve to keep your composure and remain undaunted. You take mental damage equal to twice your level, and the saving throw is a success.

Pathfinder Adventure: Night of the Gray DeathOGL