The Sigmosi Coffin was a smuggling ship owned by a triton named Jahaesko. He, alongside his first mate Ingfrid, were usually the only two permanent crewmates of the ship, as they generally traversed dangerous grounds and had a high turnover rate.

The two traveled all over the world in this ship, but mostly operated in the Dragekysten and the North Sea.

They were hired for winter passage from Hyarat to Aldrigvinter by the Krono Krew in 3E483, and got wrapped up in a smuggling deal for Lunar Skion Labs in which they were delivering an ancient dark artifact they had no awareness of. Ingfrid shot the Lunar scientist under the influence of the artifact, leading to a soured relation between the Lunars and the Coffin moving forward.