[quote=Schradinger]
Does the arena multiverse ring any bells Khan? Is it alright if I personalize their military a bit as soon as I pick them up, or is that something that would have to wait and be done IC? Mostly it would just be a better outline of troop composition and outfitting, as well as the composition and role of mages in the Legion.Though I'll be unable to edit the original NS for them, so I'm not sure how I'd go about that... Do I make a new nation sheet for any changes I need? (Such as alliances and heroes and such as they come about).
[/quote]

I'd be disappointed if you didn't. :K 

I'd imagine you can remake the NS, people who have replaced other nations have done pretty much the same. Heck someone had to remake their NS when they had been inexplicably absent for a long time. 

Up to Gcold, but you most likely will be able to.