Weapon (Rapier), Rare (Requires Attunement)
A dark and elegant rapier suffused with virulent toxin. You gain a +1 bonus to attack rolls made with this magic weapon. While attuned to this weapon, you are considered proficient with it.
Tainting Sting. You can use a bonus action to speak this magic weapon’s command word, causing debilitating poison to seep from this weapon’s surface for 10 minutes. For the duration, when you hit a creature with this weapon it must make a DC 15 Constitution saving throw, becoming Poisoned on a failure.
A creature can repeat the saving throw at the end of each of its turns, with disadvantage if it was damaged by this weapon in the last turn, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to this property for the next 24 hours.
Very Rare Variant. The bonus to attack and damage rolls is increased to +2 and the DC of the Tainting Sting property is increased to 17. Additionally, when you hit a creature that is poisoned by Tainting Sting, it takes an extra 1d4 poison damage for every turn it has been poisoned.
Spite flows through their veins; release them from their suffering.