Enervating Bolt

A beam of corrupting energy streaks toward a creature within range. Make a ranged spell attack against the target. If the target's current hit points are lower than their maximum number of hit points, you have advantage with this attack. On a hit, the beam creates a small explosion of energy which causes the target to take 1d12 necrotic damage. 

This spell's damage increases by 1d12 when you reach 5th level (2d12), 11th level (3d12), and 17th level (4d12).