This may seem like a silly solution, but in wgc a while back i did the team tourney and we had to write a story for why our forces were teaming up. I think it would be fun to write a short fluff piece for our individual armies. Imo take whatever you want, the point is to have a story behind it. If you dont want to have a backstory, its my opinion that you probably arent in this for the narrative, and thats the problem. Then again i really enjoy writing and i know not everyone does