Evoke Withering Death

You stretch out your hand, forcing one creature within range to make a a Constitution Saving Throw. On a failed save, the target takes 10d6 necrotic damage, and has their hit point maximum reduced by half the damage taken. If this reduces their hit point maximum to 0, they die. A creature slain in this way rises the next day as a Greater Undead, who sees you as it's leader. The target's hit point maximum can be restored if they take a long rest. On a successful save, the target takes 5d6 necrotic damage, and their hit point maximum isn't affected.