The Sage Tower acts as the event center of your cities. Uniting your cities, only one center can be constructed, serving all your four or five cities. Items won in special events can be exchanged in the Sage Tower, while other items such as gear and Gems can be exchanged for materials acquired in campaign primarily. As there are a large number of Sage Tower trades, this articles is meant to give an overview of these for less-experienced players.
City Buildings: the Sage Tower
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Kingdoms of Middle Earth made easy 