Drain Life

You call forth a ghostly tendril that fastens on a target and siphons its very life force to you. The target must make a Constitution saving throw. On a failed save, the target takes 7d8 necrotic damage, half of which you gain as temporary hit points. On a successful save, the target takes half the damage, but you still gain the full temporary hit points.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d8 for each slot level above 7th.