Crimson Rupture

You seize control of a creature’s blood flow and force their body beyond its natural limits, turning their own vitality against them. Choose one creature within range. The target must make a Constitution saving throw.

On a failed save, the creature takes 10d8 necrotic damage. On a successful save, it takes half as much damage.

If this spell reduces a creature to 0 hit points, their body ruptures as their own blood overwhelms them.

After casting this spell, you must make a Constitution saving throw. On a failed DC 17 save, you take 4d8 necrotic damage and become stunned until the end of your next turn. If you fail this saving throw by 5 or more, you fall unconscious but stable.