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I sold the crystal for 1500, and the game gave me a much better distribution — immediately the overview showed 3 paths to secondary mines, Griffin Conservatory, Dwarf Cottage, an external marketplace, and generally decent gold. Plus, there were 2 native heroes in the tavern. Ivor learned Earth Magic at level 4, mastered it, and at the start of the second week he got a maximum Griffin Conservatory; the next day, a third one, and a day later I attacked a walking ГО and captured the opponent's capital. We ran around for another 3 days, but in the end I had to concede to my opponent.
Thanks for the game.