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The game crashes if I capture and destroy two Elven castles with Baiar at once, but only if one of the castles was first captured by a secondary hero and remained under my control for some time, and then I decided to enter it with Baiar. At the same time, the third secondary hero already has the Tear of Ash. I think this is related to the fact that I can't have two blue keys? It's a strange issue.