Endymion Prime - History: As with many of the settled worlds in the Endymion Cluster, the human habitation of Endymion Prime can be traced back at least to the late 34th Millennium, with it reaching its apotheosis during the 38th Millennium as the region's only industrial sub-Hive World, although it never attained the scale of production and population of either Cygnax or Badab Primaris elsewhere in the Maelstrom Zone. Subject to privation and attack from pirates, xenos and Renegades owing to its proximity to the Maelstrom on numerous occasions, the planet suffered an economic collapse and overall decline during the 39th Millennium when its primary natural resources were exhausted. Its population and industrial capacity then proceeded to shrink over the intervening centuries until Endymion Prime reached its current parlous state.By 910.M41, during the sector-wide insurrection against the Imperium known as the Badab War, the Loyalist Magister Militant or supreme commander, Carab Culln of the Red Scorpions Chapter, ordered the deployment of the savage Carcharodons Chapter to subdue the worlds of the Endymion Cluster to prove their worth. The Secessionist Mantis Warriors, the ancient protectors of the Cluster, guided by the potent divinatory powers of their Chief Librarian, Ahazra Redth, had held out against the Imperial assault by conducting a protracted and highly effective guerrilla war against the Loyalist forces. The Carcharodons descended upon the unsuspecting worlds of the Endymion Cluster with shocking fury, carrying out genocidal actions that destroyed whole planetary populations. This campaign of wanton terror and destruction destroyed the Mantis Warriors' ability to affect the larger outcome of the war on the Secessionist side and soon forced their final surrender on Endymion Prime so that they could save what remained of the peoples they had been sworn to protect. Appalled by the savage actions of their allies on behalf of the Loyalist cause, the Astartes of the Fire Angels withdrew their remaining contingents from the conflict and returned to their homeworld to rebuild their shattered Chapter.In 913.M41, one year after the death of Badab Primaris and the fall of Lufgt Huron, the Mantis Warriors and the remaining Secessionist Chapters were put on trial before a specially convened Consistorial Court of their peers in the Adeptus Astartes. The Mantis Warriors lost all rights to their ancient demesne in the Endymion Cluster, with their goods and chattel given over to the Fire Hawks Chapter in perpetuity. To further compound their shame and punishment, the imprisoned remainder of the Mantis Warriors could only watch as a great swath of the Endymion Cluster's young males were forcibly culled by the Carcharodons, taken as potential Aspirants to replenish their losses in the war. They were set against each other in vicious gladiatorial contests so that only the strongest and most vicious candidates would emerge to undergo the transformation into Carcharodon Space Marines. Additionally, the Carcharodons discovered and ransacked many of the Mantis Warriors' secret bases and caches of wargear, particularly on Endymion Prime. After they had completed the cull and replenished their supplies and materiel, the Carcharodons' Chapter fleet departed the sector, headed on a vector through the Warp towards the edge of known space.