Ring of Promised Reunion

Story/Ring, artifact (requires attunement by a creature that helped reunite Anax and Cymede)

This steel ring is shaped like two hands clutching each other and can only be obtained from Anax and Cymede if you helped reunite them and returned both their rings to them (see Ring of Anax and Ring of Cymede). Once a day, you can cast the resurrection spell without expending a spell slot if you fulfill the spell’s component requirements. One time ever, you can use an action to cast either the basic use of the wish spell or one of the other specified effects of the wish spell without suffering the stress of casting the spell. You can’t wish for an effect beyond the scope of the specified effects.

Destroying the ring

You can’t destroy the ring so long as Anax or Cymede survive in mortal or spiritual form.

Source: The Gray Merchant of Asphodel