You run your hand across a bladed weapon, coating it with your own blood. The next time you hit a creature with that weapon during this spell’s duration, the attack deals an additional 1d6 necrotic damage. The target must then succeed on a Constitution saving throw or the weapon becomes coated in the target’s blood. If the target fails the saving throw, the additional damage increases by 1d6 for subsequent attacks made with the weapon while this spell is active. On a success, the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the blood cost increases by 1 hit point, and the initial necrotic damage dealt by the attack increases by 1d6 for each slot level above 1st.