Control Aqua

When used you can perfectly control water, make water and change the waters temperature by 1-500 by a negative or positive amount, & make or destroy water in a 15ft cube.

Every use partly turns them into intricately carved marble (if the carvings are investegated if they roll 17 or lower they take 3d12 psychic damage, after using the ring it 15 times ac goes up by 1 if it is used 25 times they turn into a statue and die.