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I used to build mostly mages as well... but they die quickly (hmm, not enough of them), and you can't cover everything with dwarves (unless you place them one by one), but even that doesn't help for long... so now I usually build golems =). Because melee units are needed, and with my development (genies + titans in Whirlwinds), I don't have enough of them... but in Inferno, you can start thinking about it).
Be strong. Believe