Actually started page 5 of this last night.
 
Slight problem with it.  
It’s going to be the most text-heavy page in the entire comic.
 
The bulk of it’s Celestia explaining what she wants the ponies to do and why.
 
It also includes an explanation of Warp Space, although it’s a simplified version of what the 40k fans will understand. I know some comments will be along the lines of ‘That’s not quite right’ when I get it up here.  
It’s simplified so that readers who have no knowledge of 40k can understand it.

@redweasel  
Yeah I know. Unfortunately I don’t have the right colour to do her so I had to use the nearest colour I have. Which is the light green.  
I think people should be able to tell who she is here anyway.
 
I’ve been unable to find anywhere locally that sells individual colour pencils. Might be worth having a look on E-bay. Lyra does play a quite prominent role in this story.

lyra is aquamarine btw

@40kponyguy  
I’m pretty sure canonically revealing Lyra as “the normal one” took us all by surprise :v

Seems kinda funny after the 100th episode that I had Lyra down as one of Celestia’s spies.  
The idea originally came from the fact that Twilight runs past Lyra on her way to the library in Canterlot in the very first episode. Then Lyra is in Ponyville for the rest of the series.
 
In this story, (guess it’s my own head canon), Celestia has sent Lyra to keep an eye on Twilight from the sidelines. It did fit in with the evidence in the series at the time of writing.