Discord

From your outstretched hand leaps two intertwined bolts of energy, one black, one white. 

Black Bolt. Make a ranged spell attack against a foe within range. The target takes 1d8 necrotic damage upon a successful hit, as the black bolt drains their life energies.

White Bolt. If the black bolt of discord is successful, then choose a target within 20 feet of the original target, as the bolt of white discord shoots towards them, healing 1d4 temporary hit points. The white bolt must connect with a creature if the black bolt hits, even if this means both bolts of discord hitting the same creature.

At Higher Levels. The spells damage dice and healing dice increase by 1 at level 5 (2d8,2d4), again at level 11 (3d8,3d4), and lately at level 17 (4d8,4d4).