Mesgen, the Fairweathered (Japanese: 日和のメスゲン, Hiyori no Mesugen) is a Tyrant in Xenoblade Chronicles X. It is a member of the Potamus family. It can be found at level 28 near Sayram Lake in Primordia. Defeating it is required to complete the eponymous basic mission Mesgen, the Fairweathered.