From Pathfinder Lost Omens Shining Kingdoms, which isn't enabled.

Vanish Into the Land

FEAT 7

Prerequisites master in Stealth; trained in Survival; Terrain Stalker

You're adept at using the land's natural features to find places to hide. When in the difficult terrain you've selected for the Terrain Stalker feat, you can Hide and Sneak even without cover or being Concealed.

Pathfinder Lost Omens Shining KingdomsORC