So, a while back, I mentioned that with all the psychic bullshit we have on Avernus, the reason the warp storms don't touch us is that there's a planetmind holding it off. Given nobody likes warp storms, and I had some spare time, I wrote this. Hopefully it'll help somehow.
Override.
The penguins shifted.
Command: Awaken.
The Phase Tigers shuddered.
Command: Acknowledge.
The swarms of Blink Spiders fell apart, the intricate dance collapsing into a heap of writhing chitin.
Command: Stop.
Wave after wave after wave of enormous psychic power pulsed not from, but into the planet, each and every species sending the energy of the Warp to a single central point.
Command: Gather.
Silent ranks of animals began to form, Sirens, their ladies, and their queens all in perfect lines that would have made the maddest commissar cry at how precise it was.
Command: Channel.
The perfect arrays of engineered flesh, filling entire clearings while awed humanity watched from kilometers away, unwilling to disrupt the obscene force gathered and still gathering, twitched. Warpfire and emerald lightning coursed through simple earth, mere dirt charring and changing with power that could tear a star in twain with a single release. While the mere humans filling their fortified citadels could not, were not allowed to, determine how it worked, even the least of their psychics could feel the bloated strength gathering.
Command: Expand.
And they felt the maddeningly enormous force grow. Grow like an Ork in a fight with a million billion other Orks, grow at speeds that only one human psyker had ever equaled, yet alone surpassed. And that psyker was dead. The Warp-borne goliath of power, now making even a supernova pale in comparison, still held with impossibly perfect control. Even with millennia upon millennia of decay and change, the creations of the Old Ones still were perfectly linked, to a degree even the Tyranids would envy, and that meant even this system-shattering power was not enough to push them to their limit.
Command: Finish.
And in a single instant, it vanished. The buildup of strength and will that could have cleared a fleet to ashen shards of metal, crushed a star to a single blackened point, flung planets around like marbles, evaporated in a bare thousandth of a second.
I will endure.
And the Warp surrounding the most dangerous planet humanity had ever found, screaming/roaring/blazing/changing with the death of the Emperor of Mankind, froze.
Completely.
And utterly.
Froze.
Trillions upon trillions of kilometers of space stopped like a man that hit a wall, their turbulent twists and turns forcibly flattened out as the final cry of the Old Ones enacted its first use of psychic power.
Avernus awakened. It felt the writhing mass of the Realm of Souls, and as far as it could, stopped it. The Warp Storm died, crushed like a flickering candlelight by a psychic power that made even the greatest Eldar look puny in comparison. Within the range commanded by the planet's inherited orders, there was no storm.
Objective completed. Returning to standby.
And Avernus returned to slumber, content that its job had been done. For a massive sphere of space, there was nothing but a Warp returned to peace. While without the monstrous psychic power of an entire planet forcibly maintaining such a state, it would not last.
But for a few years, it was enough. Enough that even the Ruinous Powers noticed, as their eyes on one of the rare few places they refused to engage vanished in the tide of strength. But they did nothing, for while any one of them could crush it, the fight would be enough that their kin would tear them to shreds in their moment of weakness.
Perhaps something would change from this. Perhaps nothing would change. But for a few worlds, for a few sweet years, the space-not-space that was the Warp was calmer than even Terra's, before its fall.