The Jocasta pattern grav attack[2b] is a type of grav-vehicle used as a fast attack craft by the Adeptus Mechanicus. It is known to have been used during the Great Crusade and Horus Heresy.[1] It was also used by the Adeptus Custodes during the Unification Wars, the limited number of surviving exemplars were eventually superseded by the Coronus[2a] and the Pallas.[2b]