Wondrous Item, artifact
Can only be used once a day.
Any attack (from your choice) you can reflect back, and do damage to the person dealing damage.
Ex: D M: "A rogue bandit approaches you and does..." *Rolls* "A crit amount of..." *Rolls* "32 slashing damage! Kara, you have the magic mirror, do you wish to bounce back the attack?" Kara: "Yes." D M: "Alright so... Yep. He's dead."