Knights Cenobium - Notable Members: Master Trigaine - Unknown to but a few within the Ist Legion, Trigaine was a Knight Cenobite and Master of the Order of Santales during the Great Crusade and Horus Heresy. He served as a member of Marlet Squadron under the command of Sergeant Kaye when they were sent to investigate the unrest and strange disappearances occurring around the world of Muspel. His squad, along with Librarian Aravain, were sent aboard Muspel's System Fleet, which lay silent near the planet.Knight-Preceptor Vendrahel - Vendrahel was a Knight-Preceptor of the Order of the Broken Claws during the Horus Heresy. He was among the Ist Legion's forces led by Primarch Lion El'Jonson during the Battle of Perditus. The Lion sought to claim the Mechanicum's archeotech in Umbral-51 before the Iron Hands and Death Guard did. Vendrahel's command included the Order of the Broken Claws and the Dark Angels' 79th Company. When his forces made planetfall, Vendrahel ordered his forces to attack the Traitors of the Death Guard. Umbral-51's Mechanicum unleashed their Battle-Automata in order to kill all the invaders. Though the Death Guard's forces were essentially shattered by this assault, a small contingent of survivors, including the Death Guard commander, wee able to escape and raced to the vault's gates. In the meantime, the Knights Cenobium led by Vendrahel destroyed the Battle-Automata and gave chase to the Traitors. They were able to catch up with the Death Guard Astartes before they could open the vaults which contained the precious archeotech relics. When the two sides clashed, the Death Guard Centurion Brekkar clashed with the knight-preceptor for possession of the vault. In the end, the Death Guard forces were overwhelmed and destroyed. At the battle's conclusion, Vendrahel knelt over the broken body of the fallen Centurion and whispered the names of his fallen brothers. Once he concluded his order's rites of remembrance, Vendrahel met with representatives of the the Umbral Mechanicum and claimed exclusive rights over the vault's precious relics. Adhering to the pact between their two factions, the tech-priests reluctantly handed over their cache of precious technology for custodianship to the Ist Legion. After claiming their prize, the Order of the Broken Claws deemed Umbral-51 too dangeorus to be left intact. Planting clusters of Tectonic Bombs they remotely detonated them upon taking their leave, burying the tech-priests and what remained of countless technological wonders beneath tonnes of rubble and debris.Cenobite Astilaeus - Astilaeus was a Dark Angels Terminator Cenobite and a member of the Order of the Empty Sky during the Great Crusade and Horus Heresy. He was deployed as part of the landing force that would eradicate the Night Lords' presence in the ruins of Thramas. Cenobite Astilaeus and the other members of his cenobium made the specialised skills of the Order of the Empty Sky available to the Dark Angels' spearhead and were experts in the prosecution of close-quarters battle in conjunction with lethalisclass artillery support, exploiting the chaos of lethalis fire support as shells burst in the very midst of their assault. It was a tradition that had begun on Caliban, with the heavily armoured techno-barbarian knights fighting even while their serfs and armsmen showered the field with shafts and shot from primitive projectile weaponry, and many of its adherents were of Calibanite stock.