Hello,
I've recently created a new 4 faction Expansion that I worked on for several months before posting it on the BGG forums - Apocalypic Times
The way the combat cards were put together establishes itself as balanced from the start between the newly created factions and those of the base game, you can read about how that came to be in the main thread, more importantly, it should jump out at you when you view the cards. Additionally, all the rules of the base game apply to this expansion as well.
Link to the mod in below reply.
Thank you for looking and we hope to see you on the discord if you aren't already there.
Keyser
Edited by 40k_Keyser