Gethsamaine Colonus -- or Gethsemane as it is currently called -- is a Hive World located in the former Cyclops Cluster of the Coronid Deeps in the Gothic Sector of the Segmentum Obscurus. It has a long history but is mostly remembered for being the location of the famed Gethsamaine Raid during the dark years of the Horus Heresy, when Loyalist survivors from the Iron Hands Legion conducted a bloody pogrom on the planet. Gethsamaine also holds the dubious honour of being the first Imperial world to have been conquered by the Warmaster Horus' troops on their long March to Terra, and the first human world to be subjected to the so-called Dark Compliance. A populous world, Gethsamaine's position is somewhat precarious as the region of space where it sits is prone to Warp-turbulence, which mean