You magically disrupt the blood flow of one creature that you can see within range. The target must succeed on a Constitution saving throw or take 1d4 necrotic damage and be poisoned until the spell ends or until the end of your next turn. While the target is poisoned by the spell, it has disadvantage on saving throws made to maintain concentration and its speed is halved.

This spell has no effect on creatures with no blood. This spell is a Blood spell in addition to its other school.

At 5th level, the spell deals 2d4 necrotic damage. At 11th level it deals 3d4, and at 17th level it deals 4d4.