From Pathfinder Lost Omens Hellfire Dispatches, which isn't enabled.

Mortal Healing

FEAT 2

Prerequisites Godless Healing; You follow the Laws of Mortality

You grant greater healing when the gods don't interfere. When you roll a success to Treat Wounds for a creature that hasn't regained Hit Points from divine magic in the past 24 hours, you get a critical success on your check instead and restore the corresponding amount of Hit Points.

Pathfinder Lost Omens Hellfire DispatchesORC