A Ship is the rather generic name of massive, space-faring creatures that the Firvulag and Tanu used to travel from the Duat galaxy to Earth. They travel via metapsychic D-jump guided by a navigator and pilot called a ship spouse, a separate race from the Firvulag and Tanu that specializes in working with and mating with ships.
Ships in the Duat galaxy routinely carried the Duat citizenry on intragalactic voyages of great distance, the passengers traveling within a vessel embedded in the crystal body. A mitigator program transmitted by the by the Ship to its passengers enabled humanoids to go superluminal without pain (for most distances). Ships also executed very tight subspace catenaries compared to mechanical starships in the galactic region by Duat peoples for shorter-distance transport.