From the start, I hid the Psionic creatures inside the castle. True, the birds barely managed to get to the second level. On the first level, I took 2 secondary creatures and cleared the spawns. On the 3rd level, Moner is expertizing Earth, I take a tier 3 consultant with Growth, and prepare for the dungeon: a lift and a portal on a small plateau lead to 2 compact dungeons. As the exploration revealed, one is full of chests, and the other contains 50 Hive creatures. On day 136, I received the news of the surrender: the opponent was defeated in a "dream swamp" with no roads. Thanks for the game!