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The limitations I propose are not that radical and, on the contrary, are quite rational, as they are designed to minimize the random element in the game as much as possible. They will not make the game any less interesting. If you remove the Orb, the Amulet remains. And while your suggestion may be good, it's a very rare drop, and these troops aren't free; you still need money to buy them. This is not a decisive factor, unlike the artifacts I listed.