You infect a creature you can see within range with a magical, transmissible disease. The target must succeed on a Constitution saving throw or take 4d8 necrotic damage and be infected with the disease. At the start of the target’s next turn, the disease ends on the target and moves to a creature hostile to you within 10 feet of the target. The new target must succeed on a Constitution saving throw or take 3d8 necrotic damage and be infected with the disease. The disease continues moving from target to target in this way, reducing the amount of necrotic damage by 1d8 each time the disease moves to a new target. On a failed save, the final target takes 1d8 necrotic damage and this spell ends. If a target succeeds on a Constitution saving throw, it takes half the damage, and the disease doesn’t jump to a new target, ending the spell. A creature can take damage from this spell only once per casting of this spell.