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Seriously, it's like they're designed to require you to push into the green zone for biometal to afford them, cripplingly overpriced, even just playing through the campaign. I do not recall having this problem when I played this game in the past, and it's a real pain in the ass.
No one plays scion in multiplayer, not unless some elite team wanted a challenge!

But against the AI, scion are ok..... you dont even need to do much to win, just sit back and use archers.