Black Crescent

The user channels darkness into their sword and releases that darkness with a slash that flies at the opponent. The wave of darkness retains the same sharpness as an edged weapon. Each creature in a 30-foot cone must make a Dexterity saving throw. A creature takes 4d8 necrotic damage on a failed save, or half as much damage on a successful one. The attack also has the ability to absorb other spells, while in mid-flight. You can choose one creature who failed the saving throw. The damage of its next attack or spell is reduced by the amount of damage you dealed to him.

 At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3th.