"Map Shift"
Today, the snow mountain area was in this coordinate, and tomorrow, it might change.
The season might also change from whatever it was to other seasons.
Even more possible was that, there would be an entirely new 'map', completely changing the surface map of the whole four seasons island.
This was not that strange, but such a complete island change was indeed rare, only once in a decade.
The academy also used this special transformation to hold the grand tournament for so many years.
When the Island changed its topography, the people in that changed area might also be teleported somewhere else, and everyone might be scattered or might be moved out altogether with the castle.
Many people who knew the unique characteristics of this island said that buildings and man-made things inside the Island would not disappear with the change of the topography, so it would only be the surroundings that changed.