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The Webway was a creation of those called the Old Ones. An amphibious race of highly empowered psykers who had immense powers. The easiest comparison to their might would be the Emperor of Mankind, that while the Emperor can still die in a sense they could simply deny death their due through sheer power of will.
It was their minds that forged the galaxy to how it is today. Through their actions numerous races were born upon a whim and it was their judgment that had ultimately doomed the Galaxy to the fate it had today.
One could describe it as the Sin of Hypocrisy. Here the Old Ones had created a plethora of races for their own enjoyment and played with the Motive Force as if it was theirs to temper with. When the Necrontyr, hearing of their skill in psychic might, requested those who held the ability of fate changing they were denied. The reason for that denial was that by doing so the Old Ones would be altering what was natural.
This decision was what ultimately set the galaxy to its current course. But one has to wonder if this decision was really hypocritical or something else entirely? Yes, it led to the extinction of the Old Ones but being such powerful psykers they should have known this would happen. All futures should have been easily witnessed to their mind’s eye and averted.
So, the Omnissiah reasoned, the Old Ones chose this fate.
Breaking into the Webway would have been hard with technologies belonging to the Necrons. None of them except the Doleman Gate were built specifically to interact with the realm of souls. In the laters times of the War in Heaven however gave the secrets the Omnissiah used and every discovery in teleportation Humanity had further solidified his ability.
Walking into the webway to him was only a tad harder than accessing the warp. Where he could appear anywhere within the warp with ease when he entered the Webway it was like trying to fall upon a pin while falling from space. A normal being, even the Emperor, could not achieve this feat. The Omnissiah could.
So the Omnissiah walked into the realm seeing the battle that was taking place. With a wave of his hand the machines and mechanisms that were used to help pierce the membrane of the webway were closed so that he would not cause another front of battle.
With that he flew towards the battle with weariness within his mind.