Editing The 13th Black Crusade (section)

===End's-Day Light Show===

The force of the impact of the Blackstone fragment jolted Cadia from its eons-old orbit, while the heat of the artificial meteor's entry into the atmosphere alone flash-fried everything before it, and reduced those surviving defenders who were unlucky enough to fall under its harsh glare to ash in moments. A crater hundreds of miles long and wide was gouged into the flesh of the continent, and mountains crumbled to dush in its wake. Seas boiled away to steam in the backwash, while continental plates buckled and shifted, releasing all the pent-up energies they'd held since Cadia was still young.

Massive tectonic upheaval spread outward from the point of impact, and powerful tsunamis and screeching winds heralded their arrival. Coastal bastions that had endured through the traitor bombardment and subsequent invasion vanished underneath the unnaturally tall waves of the seas that surrounded them. Even on far away Cadia Secundus, fortresses like Kasr Vark that were located more than a thousand miles inland were swallowed up by the violently onrushing waters.

Forests as old as the world burned away in the atmospheric heat, while crustal magma issued forth from the planet's rent skin, and long-dormant volcanoes flared to life across the planet, their fiery fury consuming all in their path.

Half a world away from the impact site, those who were still alive at the Elysion Fields heard the roar of the incoming winds, as well beheld the black clouds obscure the sun. Many sought shelter in the shadows of the pylons and ruined war machines there, and lived through the superheated winds that followed, while those down below had to dodge falling debris as the cavern opening yawned even wider.

The winds grew powerful enough to pick up and hurl tanks, dooming those who took shelter within, and ancient pylons found themselves uprooted, before toppling over like rotted cordwood. The black beams of light that they had been throwing into space flickered and died, and with this the Immaterium slowly came rushing back in.

The storm raged for many long minutes, but gradually lost their power, their strength downgrading from "apocalyptic" to merely hurricane-like, and they blew over a world forever changed. Cadia Tertius was gone, the majority of its center a massive glowing crater, while the rest was drowned beneath the waves. Cadia Primus was half-covered in water, with its mountains now turned into isolated islands. Cadia Secundus was wreathed in fire, as its continental plates shifted uncontrollably.