Enfeebling Smite

The next time you hit a creature with a weapon attack before this spell ends, the weapon is coated with a dark miasma and the attack deals an extra 4d6 necrotic damage to the target. If the target is a creature, it must succeed on a Constitution saving throw or its weapon attacks using Strength deal half damage until the spell ends.

At the end of each of the target's turns, it can make a Constitution saving throw against the spell. On a success, it sheds its 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 increases by 1d6 for each slot level above 3rd.