Mantle of Blood Vengeance

Wondrous item, uncommon (requires attunement)

While you wear this red silk cloak, you can visit retribution on any creature that dares spill your blood. When you take piercing, slashing, or necrotic damage from a creature, you can use your reaction to turn your blood into a punishing spray. The creature that damaged you must make a DC 13 Dexterity saving throw, taking 2d10 acid damage on a failed save or half as much damage on a successful one.

The cloak has 3 charges. Each use of the cloak expends 1 charge. The cloak regains 1d3 expended charges daily at dawn.