Agonizing Grasp

You grasp hold onto a creature within range. Make a melee spell attack against the creature, draining the victim of its lifeforce. On a hit, the target takes 1d10 necrotic damage. On your next turn you have advantage on your melee spell Attacks against the same target.

If you hit an undead target, it also has disadvantage on attack rolls against you until the end of your next turn.

This spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).