Corrupt Blood

You point your hand forward and call out the words needed to corrupt the blood of a creature, causing it to become poisoned. Choose one creature with a vascular system that you can see within range to make a Constitution (CON) saving throw. If it fails, the target is poisoned for the duration. At the end of each of its turns, the target can make a Constitution saving throw. On a success, the spell ends.

(Credit to @critical_crafting on Instagram for the spell)