Tiamat is a wyrm-type boss fought at the end of the Henne Mines in Final Fantasy XII. Vaan's party travels there in search of Fran's sister, Mjrn. When they find her, she has become mad due to a natural viera intolerance to high concentrations of Mist, in this case from exposure to manufacted nethicite, and had awakened Tiamat from its slumber. It is also fought in the International Zodiac Job System Trial Mode at stage 13.