Celestial Orrery - 13th Black Crusade: During the 13th Black Crusade in 999.M41, the Necron Overlord Trazyn the Infinite travelled to Thanatos to make use of the Celestial Orrery after the Bell of Saint Gerstahl, an ancient Imperial Shrine World artefact intended to ring when the forces of Chaos at last threatened to overwhelm the galaxy, badly damaged the master program of his own home Tomb World of Solemnace.Trazyn's welcome in the Oruscar Dynasty's halls was less than effusive -- in part due to a misunderstanding over the Oruscar Glyph of Dominance, which had gone missing during his prior visit.However, after bargains were struck and promises made, Trazyn was finally permitted access to the Orrery itself -- if under the watchful gaze of Oruscar Lychguards.As he stepped into the whirling sphere of living metal and holographic light, Trazyn realised something was amiss. The intricate webs that formed the links of the Orrery were under-lit by a crimson stain. It pulsed beneath the weave of worlds like an infection, forcing its way to the surface.Something was coming. Something that would change the shape of the galaxy. Thus far, it had gone unnoticed, but there was no hiding anything from the Celestial Orrery, for it was not merely a representation of the galaxy, but a perfect reflection of it.Trazyn realised the Oruscar had known about the rising corruption for Terran centuries -- perhaps even millennia -- but had made no move to combat it. They could not, for inaction was the price of their custodianship.But Trazyn had no such restraint -- indeed, he acknowledged no master save his own amusement. He could act, if he chose. After untold millennia, there was some appeal in playing at selflessness...But where to begin? Where was the cause of the corruption?Trazyn lost track of time studying the Orrery's pathways, searching for the wellspring of the galaxy's woes -- the source of the blight worming its way through the galaxy's heart. At last he found it, far to the galactic northwest, bordering the Eye of Terror.In the Orrery, that world was catalogued as a string of trinary data, whose details Trazyn deliberately forgot. To the Imperium of Man, it was known as Cadia. Trazyn could not recall setting foot there, not in all his travels.To his understanding, it was a drab, grey world, of interest only to the bellicose. On the other hand, if the role of saviour grew tiring, Cadia would surely offer opportunities to expand his collection of historical personages and artefacts.Through the Orrery, Trazyn learned that Cadia was home to the Cadian Pylons, the great Necron-built devices intended to help close off realspace from the Immaterium millions of standard years before during the War in Heaven.Trazyn ultimately travelled to Cadia during Abaddon the Despoiler's great assault on the world, and provided the Imperial defenders with aid against the forces of Chaos. He taught the Archmagos Dominus Belisarius Cawl how to activate the Cadian Pylon network present on the planet and used elements from his own collection of historical individuals to provide reinforcements for the Imperial defenders of the Fortress World at key moments during the final battle.Unfortunately, these would prove to be insufficient to the task, and Cadia ultimately fell to the tides of the 13th Black Crusade. But not before Trazyn made one new acquisition to his collection -- the Lord Castellan of Cadia, Ursarkar E. Creed.