An immobile, invisible, cube-shaped prison of magical force springs into existence around an area you choose within range. The prison can be a cage or a solid box. The shape of a cage can be up to 20' on a side and is made from 1/2-inch diameter bars spaced 1/2 inch apart. A prison box can be up to 10' on a side, creating a solid barrier that prevents any matter from passing through it and blocking any spells cast into or out.

When you cast the spell, any creature that is completely inside the cage's area is trapped. Creatures only partially within the area, or those too large to fit, are pushed away from the center of the area until they are completely outside the area.

A creature inside the cage can't leave it by nonmagical means. On a successful Cha saving throw, the creature can use that magic to exit the cage (using teleportation or interplanar travel). On a failed save, the creature can't exit the cage and wastes the use of the spell/effect. The cage extends into the Ethereal Plane, blocking ethereal travel. This spell can't be dispelled by dispel magic.