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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.
An arrangement of "Somnus" featuring a solo violin is used on the title screen.
"Somnus" is used in a Field Music Sequence that is available as DLC. The background that appears during this FMS depicts a large city similar in appearance to Insomnia. Out of the 52 pieces available as DLC in Theatrhythm Final Fantasy, "Somnus" is the only one not to be used in the game's iOS version or sequel.
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 person.