|This article is about the Mechanicum Vehicle; for the other uses, see Leviathan (disambiguation).
Though no two are exactly alike as they have been constructed on many different Forge Worlds, they do share common traits. All are over 50 meters tall and are as heavily armed mobile bastions, with most dating back to the Great Crusade. Some move on caterpillar treads while others walk on machine legs. The Tobularium, the Land Leviathan of Archmagos Lexell Kotov, stood on fifty trapezoidal feet arranged in parallel rows of twenty-five, each row 300 meters long.