Bone Prison

You create a nonmagical prison of bone around a creature that you can see within range. The target must succeed on a Dexterity saving throw or become restrained for the duration. The prison is an object composed of a 4-inch thick layer of interwoven bones, that can be damaged and thus breached. Each 5-foot section has AC 15 and 90 hit points. Reducing a 5-foot section to 0 hit points destroys it.