Sword of Backbiting

Weapon (any sword), rare (requires attunement)

You gain a +1 bonus to attack and damage rolls with this weapon.

Curse. This weapon is cursed, and becoming attuned to it transfers its curse to you. Until the curse is broken, using remove curse or similar magic, you are unwilling to part with this weapon. You have disadvantage on attacks made with any other weapon. When you miss with this weapon, roll a d12. If you are of a good alignment and roll a 1 or a 2, or if you are neutral and roll a 1, make another attack roll against your own AC. If the result is a hit, you take damage as if you had attacked yourself with the sword.