The Black Cage

Is where The Old Beast is locked ints in the fartest place of hell.Death and God are the only beings in existence that can go into the black cage with out dieying.

History
When God casted Lucifer into hell Lucifer made a plan to destroy the world of humans so angels didnt have any vessels to be on earth every killed human would be turned into a demon and all of them would kill all angels and the omnipotent god.But God was aware of this plan so when Lucifer created The Old Beast  god locked it into the Black Cage.

Opening/Description
The cage can only be opened by Lucifer but for that he needs the ring of the last person on earth.Its like a jail sail except if you look into it its all black nad sudenlly a neast appears and asks you to put a ring into a holder at the center of the bars releasing it.