The icon for the Shop is located at the bottom right corner of the screen, to the left of the "Inventory" icon. You can purchase various buildings for the castle there; however, some of them must be unlocked by completing research in the Citadel first. You can also buy decor, other buildings, resources and energy in the Shop as well as unique items and units from the Elite Wares Shop. You can purchase upgrades for elite forces in the Shop.
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