A ring that can bring both life and ruin.

Channeling an unknown energy from inside of it can be used to maximize the healing of an healing effect, but with each use of the ring the user will roll a d20 for chance of it to backfire. If the roll produces a 20 the ring will backfire and sucks the life from the user equal to half of the maximum healing from the intended spell. The ring has 6 charges and regains 1d6 of the charges each dawn.