Tendrils of Crimson

Dark tendrils lash out from the caster's hands and whip around in a cone of 30 feet in a direction you choose. Each creature in the range must make a Dexterity saving throw. A creature takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.
The tendrils suck the lifeforce from the flora in the area.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.