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The title of this song, played during the trailer for FF Versus XIII, means 'sleep,' but there is nothing restful about the forceful vocals singing of coming war.
- —Theatrhythm Final Fantasy description
"Somnus" is the main theme of Final Fantasy XV. It was first heard in the debut trailer for Final Fantasy Versus XIII, and it was included on Drammatica, an album by Yoko Shimomura, the piece's composer.
An arrangement of "Somnus" featuring a solo violin is used on the title screen of Final Fantasy XV Episode Duscae.
"Somnus" is used in a Field Music Sequence that is available as DLC. The background that appears during this FMS depicts a large city that is similar in appearance to Insomnia. Out of the 52 tracks used as DLC in Theatrhythm Final Fantasy, "Somnus" is the only song not to appear in the game's iOS version or its sequel, Theatrhythm Final Fantasy Curtain Call.
Somnus is the Latin word for "sleep," the personification of sleep, and the name of the Roman god of sleep, whose Greek counterpart is Hypnos. This is a possible reference to the logo of Final Fantasy XV, which depicts a sleeping woman.