Eldritch Blade

 A weapon you wield becomes wreathed in the power of your eldritch blast. Make a melee spell attack against a creature within range. You have advantage on the attack roll if the target is cursed by your hex spell or by a warlock feature of yours, such as Hexblade’s Curse or Sign of Ill Omen. 

On a hit, the creature takes 1d10 force damage. This spells damage increases by 1d10 when you reach 5th level (2d10)11th level (3d10) and 17th level (4d10).