Cage of Bones

You create a cage made of shifting spiked bones around a target and it must role a successful Dexterity saving throw or become caged with the spell. When caged, your target is restrained, and takes 2d4 piercing damage from bone spikes. Being in the cage is painful and targets generally cry out in agony. If the saving throw is successful, the target is neither restrained nor takes any damage. Cage of Bones can be destroyed; it has 40 hp and 10 AC.