User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-3039270-20110714015945/@comment-1758220-20110714023221

That might just be a gameplay thing. Because really, the Tundra is the only place Leviathans hadn't inhabited until then. If you had thrown him in the D. Island or Flooded Forest, he would just end up being another R. Ludroth, for example. Plus, the Ice/snow is really the only way his armor system could work as well. (Maybe mud could have hardened at the Desert, but we already have Barroth :/)