As two actions, you can create a vial liquid with rocky pieces suspended in it. A creature can drink the contents as an action to turns its flesh as hard as stone. For the duration, the creature has resistance to bludgeoning, piercing, and slashing damage from attacks that aren’t adamantine.

Augment

Ironskin. You can expend 1 additional catalyst so the target has resistance to bludgeoning, piercing, and slashing damage.