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

Crushing Step

FEAT 6

Prerequisites stalwart defender dedication

The weight of your armored feet casts aside natural impediments. When wearing medium or heavy armor, you ignore difficult terrain from non-magical sources. If you are a master in the armor you are wearing, you also ignore greater difficult terrain from non-magical sources.

Pathfinder Lost Omens HighhelmOGL