Enfeebling Smite

When you hit a creature with a weapon attack, your weapon is coated with a dark miasma, and the attack deals an extra 3d6 necrotic damage to the target. If the target is a creature, it must succeed on a Constitution saving throw or its weapon attacks deal half damage until the spell ends.

At the end of each of the target's turns, it can repeat the Constitution saving throw. On a success, it sheds the miasma and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the extra damage dealt by the attack increases by 1d6 for each slot level above 3rd.