Week 1: I broke through and scouted a bit in all four treasure zones, flagged the external dwelling of unicorns;
Week 2: I cleared 9 Dragon Fly Hives for 48 Wyverns, a Sword of +5 All Stats, a Chalice, a Pandora's Box with 15 Vampire Lords and a Shield of +12, took a level 2 Griffin Conservatory and stood next to a Dragon Utopia, Kyrre with stats 15-33-17-17 and Expert Earth Magic;
Week 3: I take a Dragon Utopia (1) and another one next to it (3); from the useful loot — Hat of the 5th Level Spells, Cape of Silence, and Golden Bow. I give up on everything else and fly to upgrade the Wyverns; Town Portal is not given. I upgrade the Wyverns and fly to my opponent, take their main (which turns out to be useless, there aren't even Mages there);
Week 4: I take another useless Dragon Utopia (3), finally get Advanced Air Magic, and see where the opponent is (I didn't find View Earth anywhere).
On day 143, I stand next to the opponent's Castle with a Cape of Silence, Kyrre with stats 24-26-25-25, 3 Angels and 53 upgraded Wyverns vs 59 regular Wyverns and 2 Angels of Rissa, their stats are a bit worse, and the unremoved Shackles.
Thanks for the game.