The Great White Fog began when hospitals were fixed and gave bonuses for healing. As a side effect however, moving onto a square with an animal or person on it resulted in a white screen, unless there was also a building on that square. With hunting now impossible, the already large animal population exploded and movement outside of settlements became almost impossible. Hunting killers also became nearly impossible. With the game nearly unplayable, players left Shintolin in droves.
In journals, histories and other role-played documents referring to the event, it is often described as a blizzard or a fog.