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Had Grizvald dwelling and 2 portals, even though I lost 2 of them like a noob, there was an air book on the ground, and I could pick it up with the scout hero. With the last pieces of gold, I bought some heroes to clear hives in that area and, in the last minute, rushed with Tyraxor, and view air helped me find 3 heroes, 2 of which were army + main. The timer pressure was high, and the rush seems like a good decision in hindsight (my 2 top heroes were bad).
Thanks for the game!