There once lived a king by the name of Ceros and he had little to no ambitions. During his skirmishes he stumbled upon an artifact so powerful that the entire West would bend to the owner’s will. However he chose not to expand his territory - instead his entire reign was devoted to build a twisted maze in order to make the precious artifact unattainable by mankind. He said the power within the stone was too great and could potentially destroy the world as they knew it if it fell into the wrong hands. The story of the powerstone became so famous that soon adventurers from across the continents came in hope of retrieving it. Even if many of them never came through the plethora of traps, Ceros became so afraid that he used the power of the stone to flood his entire kingdom with water. This ended the adventurers thirst for power and transformed his realm into a huge lake of clear water.
So that’s the legend behind this underwater construction. I don’t know if it’s true but I know some divers are still trying to explore the deeps of Ceros tower. If that magic stone is as powerful as described in the legend… I hope nobody finds it!