Seere

Prince Seere of the Ars Goetia. A demon with a prince-like aura, but with a loyal and servant-like personality. Deep down he's a bit of a coward, so he tends to avoid trouble and stay neutral to conflicts, but he would never allow a conjurer to be harmed.

His artifact and the part of Somnis he's in charge of is Susabo of Voyages, which is not any place in particular but the connections between all the places, often in the form of trains stations. As an artifact, Susabo is a pair of boots.