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Old 21st November 2018, 07:15 PM
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Leander Leander is offline
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Join Date: Dec 2009
Gilde: UK forum
Posts: 5,442
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I don't know if the design will change.
Upgrading both buildings requires a fully upgraded Fortress or Underworld. If one of the buildings (e.g. Mages' Tower) hasn't been maxed out yet, you cannot upgrade the Gem Mine to levels 21-25.
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