User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-184.38.31.57-20120223210415/@comment-121.223.158.114-20120301075219

Yeah, for the areas in Tri (not sure about all the areas for the other games) it goes: D. Island=Lagiacrus Theme F. Forest=Gobul Theme S. Plains=Barroth Theme Tundra=Barioth Theme Volcano=Agnaktor Theme So it's basically the most powerful monster that is exclusive to that area's theme (except for the Deserted Island, since nothing is exclusive to there).