Arcane Smite

When you hit a creature with a weapon attack, you may expend your bonus action to cast Arcane Smite. When you do this, the weapon alights with raw magic as you strike. The attack deals an extra 4d6 force damage to the target, which must make an Intelligence saving throw. On a failed save, the target has disadvantage against its next saving throw against a spell.

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.