Bloodburst

You manipulate the blood inside of a creature, causing their blood to expand and painfully strain against their veins. Choose a creature that has blood within 60 ft. of you. The target must succeed on a Constitution saving throw or take 1d10 Necrotic Damage. A creature that has been damaged by the spell can't regain hit points until the start of their next turn.

If this damage reduces the target to 0 hit points, multiple veins in the creature's extremities burst, causing one of their limbs to explode. You choose which limb explodes, either an arm or a leg.