Unbeknownst to Rune, Somnus is his biological uncle.

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Despite being an unreliable idiot (Caius's words), Somnus unfortunately works at the library Caius tends to frequent. When the Symprite is actually awake on the job, he can be quite useful in finding books and literature for Caius's studies - though he tries quite often to recommend books as well (typically fantasy or romance novels), Caius has yet to fall for Somnus's self-proclaimed "charm".