In "Warhammer 40,000", the term "space hulk" is used to refer to any massive derelict space ship. Due to the shifting, immaterial nature of the Warp, an otherworldly realm through which space ships may travel between the stars far quicker than they would be able to through real space, some space hulks are jumbled and twisted agglomerations of multiple vessels lost to the Warp throughout centuries or millennia. Space hulks may house more than just Genestealers; other threats aboard can include human followers of the dark gods of Chaos, nightmarish Warp Daemons, and Orks who use space hulks as their "standard" method of interstellar travel.