You seize absolute control over the blood flowing through one creature you can see within range. The target must have blood or a similar circulatory fluid, or the spell has no effect.
The target must make a Constitution saving throw. On a failed save, the target takes 20d12 necrotic damage, and its hit point maximum is reduced by an amount equal to the necrotic damage it took. On a successful save, the target takes half as much damage, and its hit point maximum isn’t reduced.
This spell can’t reduce the target’s hit point maximum below 1. The reduction lasts until the target finishes a long rest.
Catastrophic Rupture. After the target makes its saving throw, roll a d20. This roll isn’t an attack roll, an ability check, or a saving throw. No modifier can be added to the roll, and it can’t be made with advantage or disadvantage. On an unmodified roll of 20, treat each of the twenty d12s rolled for this spell’s damage as having rolled a 12.
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