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At the respawn there are 5 Dragon Fly Hives, but no angel conservatory or caches were found, and the exit to the treasure zone is 1.5 days' travel from the Castle. On day 117, I took a Dragon Fly Hive with 8 Wyverns and almost got wiped out at the max Dragon Fly Hive, but the opponent offered an auto draw. I took 2 Pandora's Boxes with 15k experience, upgraded to Monarchs in a swamp village, and on day 124 broke into the center — unfortunately, I never managed to find Expert Earth Magic. In the center, the only useful things I took were 2 mini Dragon Fly Hives and I captured the Blue Colossus behind a crowd of Bone Dragons. On day 127, Grundian appeared and settled in the Castle; I checked the mana count — it turned out to be 3, and given Alkin's mana for 1 Imp and Mass Shield, the Force Bolt was quite easy.
Thanks for the game.