At the southern tip of Terra, on a high peninsula with cliff edges sits a small city surrounded by towered walls. In its center sits a modern fortress of metal walls and fluorescent lights. This is Gate Castle, home of the Dark King and his Sentinel. The large main doors open to a massive Great Hall, walkways crossing the floor below, perfect roosts for snipers. Further inside lies the Sentinel barracks and training hall, and beyond that is the portal room. Any invading force would have to kill the Chosen holding the portal open or be hit by wave after wave of demons while in the castle halls, and as demons are reborn on their plane when they die on ours, they would learn quickly. In the center lies the throne room, lit almost exclusively by the screens that constantly provide the king with data he uses to make his decisions. From his terminal, the king can control the entirety of the castle's defenses, including a self-destruct function.