From Pathfinder #194: Cult of the Cave Worm, which isn't enabled.

Worm Caller Dedication

FEAT 2

Prerequisites trained in Nature or Cave Worm Lore

You pledge yourself to understanding and emulating one of the most powerful creatures of the Darklands: the mighty cave worm. You gain the Shake It Off reaction.

Worm Caller Archetype

Pathfinder #194: Cult of the Cave WormOGL