BLOOD MIST

Blood is siphoned from nearby creatures and drawn towards you in the form of a crimson mist. Each creature within a 15-foot cone must make a Constitution saving throw. Creatures missing any hit points make this save at disadvantage. On a failed save, the target takes 3d6 necrotic damage, or half as much damage on a successful save. Constructs or undead that lack blood are immune to these effects.

In addition, the caster gains a number of temporary hit points equal to half of the total damage dealt to each creature.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.