Potion (Oil) very rare
This clay jar contains a watery white oil which seems to cling to the surface of the jar. The oil can cover a Medium or smaller creature and takes 10 minutes to apply. The affected creature gains 20 temporary hit points. These temporary hit points last until removed or until 1 hour passes. If the temporary hit points are lost because damage, any extra damage from the attack which removed the last temporary hit point do not carry over into the creature’s regular hit points.