NEMOUSU秘OUS is a track in Xenoblade Chronicles X, composed and arranged by Hiroyuki Sawano with vocals provided by Yumiko Inoue. It is track 15 of disc one from the Xenoblade X Original Soundtrack. The first half of the track is heard in a few cutscenes such as when Elma reveals her true form in the Lifehold Core. The second half is heard in multiple cutscenes in Affinity and Story Missions, often during deep conversations between the playable characters.