Jinxed Ring-2/2

Curse: Once you put this ring on, you
can't take it off unless you are targeted by
the remove curse spell or similar magic.
While wearing this ring, whenever you cast
a spell, you take 1d10 necrotic damage, and
roll a d20. On a 1, you must succeed on a
DC 16 Constitution saving throw or take
6d10 necrotic damage, and the ring vanishes from your possession.