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Why bother? Just find a couple of speed rings. You'll gain an advantage at first, and then, if you have a little bit of rage, take some Knights, half of them, and the Centaurs will be defeated 100%. Or use Daughters of Earth and Executioners; you can, and even should, take Garun, level up her Retribution skill, add a speed aura, luck, and preferably also Dampening, and you'll get a strong hero without any effort.