Eldritch slash

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 takes 1d6 force damage as eldritch energy slashes at them from the void. They must then make a charisma saving throw. On a failure they become cursed, as if under the effect of the Hex spell until the end of your next turn. No concentration required.

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).