Black Vortex

You create a swirling vortex of necrotic energy that fills a 60-foot radius sphere centered on a point you choose within range. Each creature in the area must make a Constitution saving throw. On a failed save, a creature takes 10d10 necrotic damage and is sucked into the vortex, becoming incapacitated and taking 5d10 necrotic damage at the start of each of its turns. On a successful save, the creature takes half as much damage and isn’t incapacitated. The vortex lasts for the duration or until you use an action to dismiss it.