At the end of the book the Emperor ascends to the golden throne again. Why? As the imperial forces are retreating they describe the mechanicum built tunnels exploding and collapsing. The book made it seemed like these were artificial tunnels forcing an connection to the real webway. So if they collapsed how does the connection still exist? Also, when the Emperor seals the gate he turns off the machinery powering it and they end up looking at a blank wall. Reminds me of SG1 when they close the stargate. So if the tunnels collapsed and the gate is closed what is he doing on the throne at this point? I always though he was holding the gate closed. However, the way it's described it doesn't seem like he would need to do that. Maybe I'm understanding it wrong. Thoughts?