Mish-gan
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To build and upgrade Archmages, you need:
1. Gold 7200
2. Ore 10
3. Wood 10
4. Sulfur 10
5. Crystals 10
6. Gems 10
I think it's problematic to do this in the first week...
It all depends on the map. If it's, for example, "Old Friends," then upgrading mages is not a problem. If the map doesn't allow for building structures in the castle, then upgrade Golems and go for it!