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For humans, it's light, although I personally play as Necropolis (which represents darkness). Once, I fought against a mage, and if he had used mass acceleration, I probably wouldn't have had a chance to attack even once. Luckily, he was heavily equipped with artifacts (specifically, Necromancer artifacts), so I managed to slow him down as much as possible. If elves were to cast something like that, it would probably be game over!