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Hmm, these are actually important things. If a faction doesn't fit into the world, few people will play it.
I don't agree with that. Players are primarily interested in the gameplay. The more intricate and well-designed the abilities, the more interesting the battles will be.
I agree that the appearance can ruin any faction, but love will still come over time, after a few trial battles.
And epicness is relative. This isn't a fantasy novel; it's a game. Colorful cutscenes and backstory will certainly enhance it, but they won't replace the gameplay!