Wondrous Item, very rare (requires attunement by a Attunement requires a creature to expend a spell slot of level 3 - 5, using concentration for 1 hour, while being in physical contact with it.)
Property: as a bonus action you regain 1 short rest, 1 usage per day. Immediately, after its use roll a D20 intelligence check with a DC18. Failure: the stone disintegrates. Success: the stone is recharged to be used once more the following day.
Notes: Attunement requires a creature to expend a spell slot of level 3 - 5, using concentration for 1 hour, while being in physical contact with it.