Blinding Blade

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and must succeed on a Constitution saving throw or have its vision clouded making its next attack with disadvantage.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d8 necrotic damage to the target on a hit. The damage increases again at 11th level (2d8) and at 17th level (3d8).