Draining Wave

A wave of necrotic energy washes out from you in a 15 ft. cone, then back towards you. Creatures in this area must make a Constitution saving throw, taking 4d8 necrotic damage on a failed save, or half as much on a success. You gain a number of temporary hit points equal to the damage damage roll. Undead in the area do not take damage, instead gaining the same number of temporary hit points.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.