The gargoyle regains 5 hit points at the start of each of its turns. If the gargoyle is reduced to 0 hit points, it turns to stone, becoming petrified, but it continues to regenerate hit points. It remains petrified until it regains all of its hit points, at which time it enters a neutral state with a new riddle inscribed on it. The gargoyle can be destroyed permanently by a disintegrate spell or if it is fully immersed in lava, acid, or another damaging substance.