There was nothing special until day 133 when I took a double Dragon Utopia with two hats - Captain's and the blue one.. :D Then I taught Air Magic to the pawn and cleared a couple of treasure zones. Scout on a horse was very helpful, allowing me to discover an underground Cartographer, thanks to which I assembled the Cloak of the Undead King. Then with a horde of Pits - the entire 4th level. Upgraded 10 Phoenixes and 66 Wyverns, also opened a surface Cartographer on top of that, and attacked with 4 main heroes a stronghold on a horse.
I played without Diplomacy at all, and Anton had all 3 heroes :)

Thanks for the game!