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I personally have several favorite factions, and I'm sure many others do too, although I chose Necropolis simply because I don't play with them very often, and everyone tends to pick those factions right away. There's this racial tournament, where you pick one faction, and here, it's about using your favorites in battle – I'm not sure, maybe several favorite factions and then into battle, that's how I understand it. And playing a ton of games with just one faction can get boring, so it would be great to alternate.