Jade Vault of Heaven



The Jade Vault of Heaven (...) is a massive containment facility which floats high above the Land of Steam, far past the clouds. It is impossible to escape from, and can only be exited through a unique space-time ninjutsu known to only the lord of the prison. It is primarily used as a containment facility for those who have been exiled from the village; those who are deemed dangerous to the land.

Trivia

 * The prison is named after a location in the novel.