Forcecage

An immovable, invisible, cube-shaped prison of force springs into existence around an area you choose. It can be a cage (up to 20 feet on a side, with bars of force 1/2 inch apart) or a box (up to 10 feet on a side, creating a solid barrier). A creature inside the cage can't leave by nonmagical means. If the creature tries to use teleportation or interplanar travel, it must first succeed on a Charisma saving throw. On a failure, the teleportation fails. *Dispel Magic* has no effect on this spell.