You can use your mercies to transform petrified victims back to flesh.
Benefit(s): You gain a unique mercy, which aids victims of petrification. Whenever you use your lay on hands ability to heal damage, you can emulate stone to flesh on the target, using your paladin level as your caster level. This functions only on a creature that has been petrified, and it has no effect on other stone.
Pathfinder Player Companion: Monster Hunter’s Handbook © 2017, Paizo Inc.; Authors: Eric Hindley, Mikko Kallio, Luis Loza, and Christopher Wasko.