Ring of Retribution (5e Equipment)

Ring, uncommon (requires attunement)

A small, unadorned, smug fitting ring made of charred bone. It is still faintly warm to the touch.

This magic ring has 1 charge and regains 1d3 - 2 expended charges daily at dawn. While you are wearing the ring, you can expend a charge (no action required) either on your turn or during another creature's turn to activate it and cast the fireball spell centred on yourself. You automatically fail the saving throw.