Great Gate

The Great Gate is the name for the entrance to the nigh-impregnable fortress of Um'taran. It is a cast-iron door, 14 feet thick, set into a wall of obsidian and basalt double that thickness. It is laced with black sorceries, meaning that it has only ever been breached twice throughout its five-millennia lifespan: during the Battle of the Darkness by the Celestials, and in 4175, by the Host of Man.