Dancing Daggers

You create a 100-foot-radius cube of dancing, daggers centered on a point within range. The cloud lingers in the air for the duration.

Each creature that is touching the cloud at the start of its turn must make a Charisma saving throw against the daggers. On a failed save, the creature spends its action that turn being impaled by the illusion. Creatures that are immune to slash damage automatically succeed on this saving throw.