Bone Prison

     An spiritual wall of bones springs up around the selected foe. The bone prison is 10 feet high, and up to 10 feet in radius (foes of Huge size or larger are not caught in the prison). The bone prison can withstand up to 100 points of damage before collapsing. The target is allowed a Dexterity saving throw to escape the Bone Prison, the DC is equal to the caster spell save DC.  The imprisoned target is allowed to repeat the Dexterity saving every round it is imprisoned at the end of its turn to escape.