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It turned out to be an interesting game; the opponent got the Tome of Earth from the first treasure and put pressure on me, but didn't get Death Dealing in the first four builds of his Necromancer Might and Magic hero, so I had some time to recover. After three builds on both level 4 and level 5 in the Tower, I gained full control. My first treasure gave +5 to all stats and +4 to all stats, the second treasure gave nothing, and I tried to develop side heroes with Expert Earth and Air magic, but none of them got it, and there was no Flux Town on the map. I entered a treasure in hopes of finding another treasure, which I did, and it gave me a Blue Hat and Shackles. The Blue Hat bought me a bit more time because Gunnar only had Advanced Wisdom. One turn, I made a mistake and left slow units on Nagash, so I didn't reach the Rampart AI in the center, who had a treasure with an Air magic book in it. Funnily enough, this might have turned out to be my advantage because I went off-road in a desert treasure with Dessa and picked up a 15k experience box, resulting in Expert Air magic after she already had Expert Earth from a 10k box two days before. Now I had two heroes with Expert Logistics, Earth, and Air magic, against one hero on the opponent's side (Clavius). Gunnar and Brissa helped me catch the enemy scout heroes that tried to sneak around and grab my undefended towns. In the end, I controlled all the map and was free to gather everything. I made two big mistakes towards the end; one was that I didn't think my castle village was reachable in the corner, but it turns out there was a subterranean gate which made it reachable in one day, so Clavius attacked me there. The other mistake I made was in the final battle when I blocked the Power Liches, and this gave an opportunity to take retaliation off my big stack of skeletons, but for some reason, he didn't do that. Then I was facing 124 Earth Elementals, but I had the Black Orb and could blind them after killing the remaining troops.
Thanks for the game!