Board Thread:Warhammer 40k General Discussion/@comment-6589306-20130610072240/@comment-7186329-20130612163237

This has been partially covered on other discussions. Such as this one

http://warhammer40k.wikia.com/wiki/Thread:28944

quoting myself

There are severalal possible scenarious for that, the one in which The Emperor is a key figure might be as follows. Apart from empowering the Astronomican, its reach also acts as a shield preventing Chaos from going all out on realspace within the boundaries of the Imperium. The power source for the Astronomican, or at the least a key component, is The Emperor Himself, therefore it is viable to assume that if He is disconnected from the Astronomican it would stop to function. There are several threats which could damage the A. and the Imperial palace enougt to destroy it, the Tyranids and the Void Dragon are the most likely ones. When the second attack upon Terra does happen, regardless of who attacks, it would be gruesome and the A. would be badly damaged and stop functioning. At that moment the `shielding` it provides would be removed, giving Chaos unrestricted access to realspace, and the two Armies in the Maelstorm and Eye of Terror will be provided full Chaos support and attack, most likely the Tyranids, or several possible targets. Once the CSM along with demons are within the boundaries of the `Shadow in the Warp`, which negates Chaos, they will be threatened, causing the Chaos gods to use their full power to `override` the Shadow in the Warp, resulting in a massive loss of power. It is possible to literally remove parts of the Chaos gods, by destroying their demons permanently, the GK can do that. That massive destruction of parts of the Chaos gods would leave them weakened for the new Eldar god to be born, and fight Slaneesh. The remainder of the Tyranid fleets, having sensed the danger will then attack the Eye of Terror, further weakening Chaos. That leaves the question of the C`tan gods, and their role in this. It has been said that the C`tan are older than the Chaos gods, and they hate eachother, and have battled numerous times. The C`tan will attack a Chaos god, not sure which one, and defeat them. Meanwhile The Emperors soul will ascend to the Warp, and fight Chaos there.The Eldar will face the Necrons, and will die, resulting in the birth of the Eldar god of the Dead. Everything is going to attack Chaos before starting to attack eachoter, resulting in a massive free for all conflict.

And here are some of the possible ways the Golden Throne can break down. This does not cover what could happen afterwards.

It breaks by itself, after an unknown time period

It suddenly malfunctions, resulting in an immediate breakdown

The Tyranids attack Terra

The Void Dragon attacks Terra

Chaos, the 13th Black Crusade attacks Terra

Sabotage from within, namely certain parts of the inquisition

The deamons that are held back are unleashed

Second Warp storm manifests again by the combined power of the Chaos gods

The Emperor somehow overcomes the Golden Throne by Himself (unlikely but possible)

The Necrons make the Sun explode