Dust of Suleiman

You conjure a cloud of fine dust that harms supernatural creatures. You create a 30-foot-radius @variantrule[Sphere [Area of Effect]|XPHB|Sphere] of dust centered on a point within range. Choose a creature type other than Beast or Humanoid. Each creature of the chosen type within the @variantrule[Sphere [Area of Effect]|XPHB|Sphere] take 20 Force damage. A creature also takes this damage when the @variantrule[Sphere [Area of Effect]|XPHB|Sphere] moves into its space and when it enters the @variantrule[Sphere [Area of Effect]|XPHB|Sphere] or ends its turn there. A creature can take this damage only once per turn.