Curse of Aufgeben

You send cursed energy coursing through a creature within range, causing it to be cursed. The target must make a Constitution saving throw. It takes 10d8 necrotic damage on a failed save, or half as much damage on a successful one.

A creature cursed by this spell start roting and takes 3d6 necrotic damage every round until someone cast dispel curse or greater restoration on the creature.

If a humanoid is killed by this spell, it becomes a zombie 1d4 rounds later.