Sirene, the Lost (Japanese: 迷子のシレーヌ, Maigo no Shirēnu) is a Tyrant in Xenoblade Chronicles X. It is a member of the Lepyx family. It can be found at level 13 at FN Site 114 in Primordia, near East Gate Plain and Roof Rock. It must be defeated during the eponymous basic mission Sirene, the Lost.