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This map can be completed with a hero, but it's quite challenging.
You need to defeat a large number of troops with your starting army, which involves many long battles. In particular, the battle with 11 Titans for the blue tent was difficult; I finally won without any losses after several attempts. Later (I haven't done it yet), I'll need to take two valuable dwellings, one with Mages and the other with Djinns, from groups of Bone Dragons on each side. This is quite difficult for my army of 8 Djinns, 7 Vampires, and 1 Dragon, plus some Tier 2 troops and a hero with Level 2 magic skills – I'm counting on an ally who is a Demonologist.
However, the 11 Titans couldn't be defeated; on the other hand, there are dozens of Vampires, which is even worse – I think they're there permanently or for a very long time. The only seminary provides cold magic skills in this scenario – 2 from nobility, 1 from scouting, and something like tactics. There are no portals to the city in the castles.
You can complete the Medusa dwelling without defeating the Bulls, which is good – a group of Bulls would be impossible for this army. They even let caravans pass, but they don't let the hero who entered leave – but one escape will solve everything, and I'll get +2 Medusa shooters. In total, there will be about 60 Medusas, but for now, I'm keeping them in the garrison because they are good fighters, but they move slowly.
But for now, I don't have enough money, so I'm building Mages everywhere; Golems definitely won't be helpful. I've captured 2 cities, built 2 treasuries, and placed a Naga on guard, just in case, but I can't place Djinns. I'm going to clear out the top part of the map.
For now, the progress is as follows:
https://c2n.me/4crhfCG – the Medusas are moving in a caravan of 22, and I need to buy another 40. The Ifrits will go to rest; they're not very useful anymore. There will be a squad of Mages and a hero, and the starting Dragon will be replaced by Mages.
In general, if I buy 16 more Vampires, it will be easier, but I don't have the money