As for why the sea level rose so much during the Void Century, it would be natural to assume the work of a sudden natural disaster, but I can state for a fact that this was a man-made disaster! If such a cataclysm were caused by natural forces, then the initial disaster would have spanned several centuries and inflicted slow but continual damage upon the world. However, by any measurement — be it climatology, geology, environmental and atmospheric science, this dramatic shift could not have happened within a single century. So, the cause is something else. When I detected the rise in worldwide sea levels the other day … I had my answer.
I knew the cause and confirmed its existence: the ancient weapons that sank the world into the sea 800 years ago still exist today, and await the moment that they stir once again. In other words, the vast war that arose during the Void Century never came to an end!