Eldritch 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 as well as the eldritch energy engulfing your weapon as you hit the creature. The creature takes 1d10 force damage.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 2d10 force damage to the creature on a hit. The damage roll increases by 1d10 at 11th level (3d10) and 17th level (4d10).