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I finished this map. It's not difficult, but it's fun.
At the end, after I joined the Astral Dragons, the demon changed his mind about running away from me and decided to stay in the castle. I didn't try to defeat him in the castle, but I solved the problem in another way - I didn't capture the dragons until he got too close, and then I caught up with him =)
P.S. I noticed a bug - I couldn't enter the northern Arena, which gives +2 to attack/defense, because... it wouldn't let me in. To make everything fair, I had to add stats through the console xD
P.P.S. I started rereading the forum and saw that people were writing about the non-working Arena, and you won't be finishing the map. Well, that's okay, but what are the names of the maps that continue this story? It was very amusing :D