Dagger of Endless Stabbing
Weapon (dagger), rare (requires attunement)
You gain a +2 bonus to attack and damage rolls made with this magic weapon. When you roll a 20 to hit with this weapon, you may make an extra attack as part of your Attack action.
Curse. Immediately after you hit a creature with a melee attack using the dagger, make a DC 12 Wisdom saving throw. On a failure, you enter a stabbing frenzy and must use each turn to move to the nearest creature and use your action to make a melee attack with the dagger. If you have the extra attack feature, make as many attacks as each action allows. Repeat the saving throw at the end of each turn, ending the frenzy on a success.
Witnesses can see the sheer maniacal glee in your eyes as you jab endlessly, humming a jaunty tune. Friend or foe it matters not! For the joy of stabbing is all you’ve got!