"Mirrors"

In the first one, I cleared 2 native secondary heroes, placed Harpies in each, and also added Cyclopes at home.
As for the swamp, trying to break through with Magogs at the very start wasn't really an option, and from the second turn, the action in the treasure zones started, so it was no longer a priority.
121 - I bring Harpies from the main, Crag takes the max Dwarf Cottage, which allows me to buy up the remaining Harpies, and I start leveling Cassia. I got her 2 Nagas' dwellings, which turned out to be level 2 and 4. + the supply chain went for the home Medusa dwellings and a full buyout.
I saw that Giants were revealed in the Tavern, meaning the workshop near the secondary hero's Castle was likely taken. And I correctly assumed that Tyrax went to the nearest treasure zone for Boots of Speed, 2 Dragon Fly Hives, a Zealot's Blade, and a Box of experience.
122 - On the 2nd day, I managed a buyout, upgraded the Harpies, built a Mage Guild in all 3 towns, but only had Haste. I bought a Spellbook for Crag and Cassia, Terek got a Scholar, went for a Shrine with Slow.
A scout hero checked the workshop - level 2, we take it.
123 - Minor Nagas' dwelling and a dive into the treasure zone. Crag got Logistics and Earth Magic.
124 - I dive in. Zealot's Blade, Boots of Speed, a village. According to the Tavern - the village was occupied on the same day, which is decent. I defeat Cassia, she goes to clear 100 Ice Elementals for a Dragon Fly Hive and 50+ Magi for a Box. Cassia also has Earth Magic. There were about 70 Magi + a level 3 scroll, so I risked taking the Box with Cassia, since there couldn't be any Magic behind such a number. 10k experience gave her Expert Earth Magic. I retaught Slow via a Scholar.
125-126 - Crag ran along the road, found 2 Zealot's Blades, a level 1 Griffin Conservatory, a Box for 10k experience. Crag has Wisdom. Supply chain into the second treasure zone. Where on 126 he managed to take a village and do some scouting.
127 - I run through a portal into a snowy treasure zone to another plane. Along the road, a Zealot's Blade and 2 Boxes behind 100 Satyrs are visible. I was a bit short of reaching the village, wanted to split Crag there, but had to travel on foot from the village. Praying that the opponent doesn't pop out of the fog and wipe out the army on the scout hero in front of the village. The treasure zones are kind of empty, resources are just insane, so I decide to build a Mage Guild in the Conflux village (essentially the only possible town for that at the time). Cassia took a Box for 15k gold.
131 - Crag harvests Boxes behind the Satyrs, 5k experience and 15 Beholders. Buyout.
132 - I plan a supply chain into the treasure zones from the 2nd secondary hero, where everything looked quite juicy. A couple of Dragon Fly Hives, a workshop, a scroll, an external dwelling of Firebirds. A reckless scout revealed a piece of a Dragon Utopia in the snow, Crag runs there. Crag already has Air Magic and retaught View Air. Joy overflowing, I even forgot that I'm leaving myself exposed again.
133 - A level 3 Dragon Utopia, which dropped КЗ and КО. Had to think a bit about how to play the supply chain differently. Crag visited a Stables and stands near a Double Mana. From the scrying views - the opponent is hustling in my swamp.
134 - Captured a new village in the treasure zone via a supply chain through an external Tavern. There I managed to grab a couple of Zealot's Blades, an Earth Magic booster, a Library for Crag. I see - the reds are very close. Thought that Tvar'yna also took a Dragon Utopia with КЗ and went for a breakthrough to take the main. But the spell points were low, so I calmly spend the night with Crag at home. Though I messed up and didn't pass the Golden Bow when there was a stack of 40 Cyclopes. Finally built Mage Guild level 5 - which gave Dimension Door.
135 - Mephala ran back, and on foot at that. (Maybe decided not to reveal Town Portal?) A hero ran along the road for scouting, there was Gunnar - decided to kill him with Cassia (since she was the only one who could reach him) and return via Town Portal. Placed a scout hero to break open the last Inferno treasure zone. By its size, it looked quite rich. Crag went to scout another plane through a treasure zone that was taken the day before. There, right next to the portal - a Dragon Utopia which gave +4 All. In the last seconds, I managed to sit in a village and build a Mage Guild.
136 - I wanted to transfer the army to break into the Inferno, and have Crag sit somewhere to replenish mana, so I could move on Tvar'yna's Inferno the next day. + I was considering whether to put Cassia on breaking the treasure zone with the +4 All Dragon Utopia. Decided not to risk exposing her, as I really didn't want to lose her - she's essentially my 2nd hero with control. + Tvar'yna still had a supply chain to the swamp in case of emergency.
Crag went with Dimension Door for one Zealot's Blade that was behind the mountains, planning to return via Town Portal. And with the Telescopes, a corner of another Dragon Utopia was revealed, which gave good stat boosts. The Inferno remained unbroken (
137 - Continued after the save the next day. Via supply chains, I collected Pebbles and Firebird external dwellings. Crag finally advanced on the opponent's Inferno. I decided to leave my own for now, since it shouldn't run anywhere.
141 - Crag reached the village, a bit of scouting, Town Portal home. Buyout. At the end of the turn, I cast View and see Tvar'yna's supply chain heading to the Inferno. Didn't manage to scout, but at least evacuated the meat.
142 - Entered my Inferno - turned out to be empty.
143 - Was thinking about the best way to dive in and catch Mephala, scouting views showed the opponent near the Dragon Utopia with +4 All. I move Crag there and find Mephala in a village. Overwhelming advantage in all parameters, so the final was a formality.

Thanks for the game!