Talon's Sanguine Upheaval

You take hold of a target's blood and force it to momentarily flow in the opposite direction. The target takes 6d8 necrotic damage and must make a Constitution saving throw. On a successful save, the spell ends and the creature suffers no additional effects.

On a failed save, the target is poisoned and stunned. The target repeats the saving throw at the end of each of its turns, ending the spell on a success. If the target fails three consecutive saves, or if it fails a save by five or more, it immediately falls unconscious and begins making death saving throws.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the initial damage increases by 2d8 for each slot level above 6th.