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

Tunnel Wall

FEAT 4

Activity 1 action

Prerequisites shield block; stalwart defender dedication

Requirements You are in Tenacious Stance.

Using your shield, you guard against the movement of foes as surely as if you were a wall of stone. You Raise a Shield and become anchored for 1 round. While anchored, you gain a +4 circumstance bonus to the DC to Tumble Through your space.

Pathfinder Lost Omens HighhelmOGL