You summon dark energies to drain the life of other creatures and bolster your own. Make a ranged spell attack against a creature within range. On a hit, the target takes 7d10 necrotic damage, and you gain temporary hit points equal to half the amount of necrotic damage dealt. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.