The following is a G.R.A.D.D. report on the "disappearance" of Snow Tower/Fort
On October 5th 2015, the entire structure of Snow Tower disappeared. Gathering reports from the last know guild to be towering in said tower, Helios, the only clear linear data collected was that all players were warped out as part of an evacuation. Within minutes the first response of North Graal Fire Department, with the assistance of some volunteers from Graal Fire Department, quickly assessed the situation.
From the initial report, it appears that the entire structure that lead to the icy caves underground had completely disappeared.
But after further investigation, we discovered that the structure simply collapsed within the large icy T-shaped cavern, and the snow quickly covered up the roof, thus giving the impression that the building completely disappeared.The main foundation of the building was above the icy T-shaped cavern, that when possible, failed to hold the main structure after what most are determining to be Global Warming. The ice columns holding the structure melted to a breaking point resulting in the structure falling in the cavern, and the snow continuously falling in snow town buried the structure shortly.
Although most blame falls into the global warming, this answer doesn't answer why the snow is continuously falling, or that there is any snow left above at all, our most outrageous theory was that the tower was an inside job, that someone melted the icy structure and caused it to collapsed. We cannot investigate this however since the entire building is in the way of the area of interest.