A Blackout

As the quick successive strikes against key worlds in segmentum and the total annihilation of imperial fleet command all is chaos within the command chain as contradicting orders are sent out with a new enemy emerging and haven't been met before and are using combined arms and are good at long rage attacks while also possessing a marital skill that rivals that of Astarte's veterans.

 And as the dark throne went active all psykers feel heavily restricted and cry out in pain as ships in the warp are quickly dropped out travel and chaos are heavily effected with machine sprits being suspectable to being Digitized they quickly spread due to not having many in the dark mechnaicus sing their unholy prayers as the machine sprits become to see the void dragon as a creator and a god.

POV Gulliman 

Reports have stopped coming the whole segemntum is probably under siege, chaos forces themselves are erratic and thrashing around like a beast that struggles while dying we have lost all communications only small parts of information came in from psykers with this new enemy having a technical prowess that far stretches the imperium I've also heard from Yevraine that the gods are also unable to see inside the segemntum a "black out."

Is what I have heard the mechanicus priest mutter with themselves being oddly quite, my resurrector Cawl explained to me " Lord regent, a new species means new possibilities of STCs and if not they are capable of adapting extremely quickly such as against the death corps of Krieg." 

What he refers to is psykers message and shown memories of these new enemies the death corps tactics of heavy fortification were broken within a day as they quickly got used to the tactic used by the Kriges they used a type of bomb that shifted gravity and dispersed over a wide area burying many of the emplacements. While the artillery that would have halted their advances were systematically wiped out with aircraft phasing in and out of existence.

And not to start with situation in space agedly massive Titians capable of both cosmic travel by themselves are then turning into ground weapons are prevalently with all the new enemies vehicles having a sort of transformation we have not seen one of the beings physically this race might be on par with the Xenos know as the Necrons. 

The indomitus crusade must succeed for the implications of losing segemntum obscrus might be the last nail that was needed to break the back of the empire.

POV Eldar Farseer onboard Yme-Loc, minor craft world.

I feel a sense of foreboding yet the whims of fate do not answer my call, Vauls priests are also lost with their machines seemingly glitching that has never happed within the history of craft world Yme-Loc as I was in completion till a warrior came into my chamber. 

"Farseer we are surrounded !!" I stood up fast before I could question what had surrounded us I was interrupted by loud series of explosions as our war engines seemingly had a mind of their own and they attacked. With many going towards the sprits stone storage and the titian area with dread I realised what had befallen us as the ancient tomes spoke of one beyond Vaul in the sprits of the machines I whispered in a fearful tone "Void..dragon" as I finished saying this the world went blank as I fell into a slumber.