From Pathfinder Lost Omens Highhelm, which isn't enabled.

Upset Balance

FEAT 6

Activity reaction

Prerequisites stalwart defender dedication; expert in Athletics

Trigger You are damaged by a melee Strike.

Requirements You are in Tenacious Stance.

You lean into your foe's attack, using the weight of your body and armor to send them reeling. Attempt an Athletics check against the creature's Reflex DC. On a success, the target becomes Clumsy 1 until the end of its next turn (Clumsy 2 on a critical success). If you are anchored, you gain a +2 circumstance bonus to this check.

Pathfinder Lost Omens HighhelmOGL