Vitality Drain

You drain the essence of life from a nearby creature within range and force them to make a constitution saving throw.  On a failed save, they take 1d4 necrotic damage, and you gain advantage on your next saving throw.

This spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).