Rod of Meteor Swarm

Rod, legendary (requires attunement by an arcane spellcaster)

As an action, you can use this rod to cast meteor swarm once per day with a saving throw DC of 20. It recharges each day at midnight. Each time it is used, roll a d20. On a 1, the Meteor Swarm is twice as powerful, but the rod consumes itself in the casting and is destroyed.