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I played the "Broken Alliance" battle :) on "difficult" level against 5 "strong" AI opponents with Haven. My heroes were the mages Eilin and Rosalia. You can find the mage development guide in the "Hero-Mage Development" section for Haven. It turned out to be not too difficult. But this was my first time playing this level with Haven, so, unlike playing with Necropolis, there were some minor losses in troops. But Haven has decent potential. Firstly, I managed to make a lot of mistakes and shortcomings (see "Hero-Mage Development"), and secondly, I didn't have time to replay some moments (replaying which would have resulted in a much better and faster outcome). I often forgot to use the racial ability. I didn't even buy Sun Riders and Guardians at all, and only bought a few for the second hero at the very end to strengthen him. I easily upgraded all the buildings in all the cities and easily rebuilt them. This time, however, I sometimes ran out of mana at the start. I built the Tear of Ashera at the very end of the game. I finally developed the first level of blood magic, "Holy Blades"; it turns out there's an upward arrow that appears, you just need to click it, and I didn't know that before :). I only gained 350 blood points, while the opponent, a Golden from the Bastion, who was 5 levels lower, gained 2300 blood points. How is that possible? I haven't learned all the abilities of Haven's troops yet, so there's potential to reach Necropolis's level; I need to compare them further.
There were several battles; the opponent often fled. In the end, I fought against a Golden from the Bastion, Yugen, level 23, and defeated him, although there were some minor losses; the experience gained in one battle was 110,487. The game lasted 4 months and 3 weeks.
If you compare Haven with Necropolis, Haven has a large set of medical supplies and medicines:), there are so many that it's hard to choose what to use; it has a very large medical and defensive set. That's why I jokingly called Haven "Defensive Medicine." And Necropolis is about attack, simplicity, and efficiency, and overall military harmony, so I jokingly called Necropolis "Attacking Resuscitation." ;)