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I gathered an army of 121 units from my starting town and two neighboring ones; after that, it became quite easy. In the treasure, I found shackles and took a Utopia with sandals; my heroes were leveling up nicely. On day 133, Labeta with her birds rushed in through the dungeon and defeated a decent Djalar. I couldn't reach her with my leveled-up heroes, so I covered her with a zero-level lock and emptied my entire inventory. Of course, Armageddon arrived, but after discovering the shackles and the AotD, she surrendered.
Thank you for the game!