The Rock - The Rock: The Rock, officially known as the Angelicasta ("Tower of Angels"), is the massive mobile fortress-monastery and home of the Dark Angels Space Marine Chapter.It was once a part of the Dark Angels' lost homeworld of Caliban upon which sat the fortress-monastery of The Order, the elite monastic order of knights that was led by the Dark Angels' Primarch Lion El'Jonson before he was rediscovered by the Emperor and from which many of the later Astartes recruits for the Ist Legion were drawn. After Caliban was destroyed by a Warp Storm summoned by the Ruinous Powers that tore the world asunder during the rebellion of Luther and the other Fallen Angels, the Dark Angels reshaped the old fortress into a massive mobile fortress-monastery. It was outfitted with the most advanced Imperial technology including a Warp-Drive, gravity generators and void shields so that it could serve as their mobile headquarters as they sought to hunt down every one of the Fallen.The Rock serves as the primary source of imprisonment for every one of the Fallen hunted down by the Dark Angels Chapter and its Unforgiven Successor Chapters, as they believe that they can never restore their honour in the eyes of the Emperor until every single one of the Fallen has been captured and forced to repent before they die.The Rock also held the greatest of the Dark Angels' secrets: the Arch-Traitor, Luther himself, was alive and well in its deepest dungeon, kept alive by a stasis field while he insanely mumbled that he had no need of confession or repentance, for one day Lion El'Jonson will return and forgive him for his sins against the Emperor. Luther was freed by an assault of Daemons upon The Rock after the opening of the Great Rift. he is now free to plague the galaxy once again.Caliban, the ancient homeworld of the Dark Angels, was once a verdant world of dense forests. Those forests seethed with mutation and corruption, the baleful influence of the nearby Eye of Terror making Caliban one of the deadliest Death Worlds in the galaxy. The original inhabitants of Caliban are said to have been a proud, martial people similar to the medieval European society of Old Earth, brought up to live and die by the sword.The lush forests were inhabited by all manner of terrifying Great Beasts that had been warped by Chaos. The ferocity of these creatures forced the people of Caliban to build brooding stone fortresses in huge clearings hacked from the forests, in which the Calibanite warrior-elite dwelled. It was from one knightly monastic organisation drawn from this aristocracy, called The Order, that the officer class and most of the later Astartes of the Dark Angels Legion were recruited.During a terrible battle immediately following the end of the Horus Heresy, the entire planet of Caliban was torn asunder, reduced by the power of the Warp and the effects of a cataclysmic orbital bombardment to scattered debris. All that remained was the fragment of Calibanite rock upon which stood the ruins of The Order's fortress-monastery. In the long millennia since the destruction of Caliban, the Dark Angels have drilled deep into the bedrock of this fragment and rebuilt the fortress' ruins.The dead asteroid was transformed into the Dark Angels' home, called The Rock, while the rebuilt monastery is referred to as the Tower of Angels. Countless tunnels, halls and chambers were constructed and, in time, even a Warp-Drive and more powerful Void Shield emitters were fitted to allow The Rock to move from star system to star system. As a result, The Rock does not stay in any one place for any length of time, and the Dark Angels recruit their neophytes from a variety of different worlds.Many dark secrets lie deep within the ruined Tower of Angels. Dungeons that have remained sealed for centuries and secret caves shut behind adamantium doors and bound with holy sigils conceal vast repositories of ancient archeotech. Only the most senior of the Dark Angels, the Masters and the members of the Chapter's Inner Circle, are aware of these chambers' existence and may unlock their dread secrets.