Walkthroughs for custom maps.

Haven't you seen anything about the map "Zemsta Mutare"? I only found a discussion on the website where it's posted.

I glanced at it. The website says that they can't find Mutare on the map and that it needs to be added using the editor before the start, but someone writes that you need to think about how to find it and that it is possible. I don't know, I didn't delve into the editor.
But visually, the map doesn't look very complex right now. There are taverns and mage guilds (after the Chinese maps, this looks like a cheat! :). You can buy Jedite and retrain Resurrection and Prayer. If you're lucky, there will be Forcefield or any other key magic in the castles.
In the tavern, you can buy Logisticians, Tazi, Kreg, Mullich, and then after killing, you can buy Jelu for archers; in general, play as whoever you want.
I think you need to look for a good starting save, depending on what magic they give you.

Added 3 minutes later

One of the Chinese players is actively playing online on our forum.

Herolwy comes to mind.