Schism is a mod for YR featuring three factions designed to be as different in playstyle as possible; the terrifying and high-maintenance Imperium, the direct and dependable Republic, and the mysterious and insidious Order.
Kind of old now but in my opinion a well thought out mod, kind of simple in some aspects but the variety and differentiation between each faction is on point. The special units, are incredibly hard to find though, more than necessary