Tendrils of the Blood God

Calling on the power of the Blood God, tendrils of blood erupt from you and batter all creatures within 15 feet of you. Each creature in that area must make a Strength saving throw. On a failed save, a target takes 3d6 necrotic damage. On a successful save, the creature takes half damage. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st. Each additional spell level requires an extra pint of blood.