Guthallath

"Entire civilizations have been swept off the face of Golarion due to the devastating rampage of a guthallath. But there is a light at the end of the tunnel, for after some time the guthallath ends its massacre in a swift yet seemingly random way. The colossus then finds a remote location deep in the wilderness, where it buries itself entering a deep slumber for years - if not centuries- before awakening and beginning the destructive cycle once more."