After the skaarj invaded the Nali Castle, some of the most influential people from the ruling lineage felt the need to relocate to a safer place. They built a fortress above the reservoir of a lake, hidden between high mountains, and kept it in a state of levitation thanks to an unknown magnetic field. With the passage of time, the strenght of the magnetic field decreased and gradually the structure began to collapse, with parts falling down into the lake. Every now and then, another section of the structure gives way and collapses into the lake below and thus the fortress is reduced in size year by year. But don't worry about it though; with the life expectancy of combatants in the Tournament, you will have more pressing concerns to worry about.