The creature and nonmagical objects on its person turn into a solid inanimate substance. Its weight increases by a factor of 10 and it ceases aging, is incapacitated, can’t move or speak and is unaware of its surroundings.
Attack rolls against it have advantage.
It fails all Strength and Dexterity Saving Throws.
It has Resistance to all damage.
It’s immune to poison and disease, but those already in its system are only suspended.