The main fleet emerged from dimensional space at the very edge of the Eye of Terror.
Its current location was where the core of Commorragh had previously been teleported out of the Webway, before the C'tan had sent it back to the point before the Big Bang.
Part of Commorragh's cityscape, fused and overlapped with planets, still remained here.
The forces of Chaos had once intended to build a void fortress in this star system, but that massive undertaking had also been destroyed by the aftermath of the Battle of Commorragh. Now, only a small number of Black Legion members remained stationed here.
They amounted to merely two warships and a small garrison on a half-daemonized world.
The instant the main fleet emerged from dimensional space, it concentrated fire on the two warships and destroyed them at once, while also launching nanite swarm torpedoes at every planet in the system.
The nanite swarms that had demonstrated their might during the Defense of Baal and the Iron Man war against the Tyranids remained just as effective now.
When the torpedoes struck the planetary surfaces, they released a cloud of white mist. The nanomachines within devoured everything on the surface and converted it into material for producing more nanomachines, until the white mist grew into a White Storm that swept across the entire planet.
The Black Legion garrisons on the planets were quickly consumed completely by the White Storm.
Engineering vessels detached from the main fleet and headed to the planets to construct small Obelisks, then foundations for larger Obelisks. Eventually, they would establish a Blackstone array capable of suppressing an area spanning more than a dozen star systems.
If the main fleet had followed the original strategy, as Chagatai and Sanguinius's fleets had, it would not have continued forward at this