Once a day using a reaction and a charge from the ring, when you roll a critical failure you may instead make the roll a critical success. The damage is tabulated as normal. Each time one of the 3 charges is expended the crystal fractures a little. After the third charge is expended the ring shatters completely and the total amount of damage dealt by using this ring is halved and explodes outward for a 20-foot radius.  All creatures in that radius must make a DEX save DC 14, on save they only take half the damage rounded down.

Curse: Once the ring is put on it cannot be taken off (unless the wearer chops off a finger)

Notes: Tally the total damage of from the ring in the notes, upon expending the last charge half that damage in an AOE of 20 ft., If you take damage while wearing this ring it automatically attunes