Blood Bath

An explosion of blood energy explodes from a point within 60 feet of the caster with a radius of 30 feet. All targets within the affected area must make a dexterity saving throw and take 4d8+10 necrotic damage and an additional 2d6+10 force damage on a failed save and half as much on a successful one. 

At Higher Levels. At level 10, targets that make a successful save now take 3/4 damage dealt, at level 15, an additional d8 (5d8) is rolled, at level 20, targets who fail critically are immediately consumed by blood and take an additional 30 necrotic damage.