Er@ser
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Why can't they be compared? They can. You just need to know how. I was simply comparing them based on their impact on the game's development: the cloak is such a powerful artifact that as soon as the Necropolis finds it and manages to use it for a while, victory is practically in their grasp. Other artifacts don't bring about such a fundamental change in the game. Therefore, the cloak is the "most powerful" artifact.