Blood Boil

Blood Boil – As an action, you can violently agitate the blood within nearby creatures. Choose one creature you can see within 60 feet that has blood. That creature must succeed on a Constitution saving throw (DC = 8 + your proficiency bonus + your spellcasting modifier) or take 4d6 necrotic damage and 4d6 fire damage and be unable to regain hit points until the start of your next turn. On a success, it takes half damage and suffers no additional effect. If a creature is reduced to 0 hit points by this feature, you can immediately harvest its heart as if you had used Heart Consumption. At Blood Tier 2 in at least one hand, the damage of this feature increases to 6d6 necrotic and 6d6 fire, and on a failed save the target’s speed is reduced by 10 feet until the end of your next turn. At Blood Tier 3 in both hands, you can target up to three creatures within range, each making its own saving throw; on a failed save, a creature takes 8d6 necrotic and 8d6 fire damage, cannot regain hit points, and has disadvantage on Strength and Constitution checks and saving throws until the start of your next turn.