Walkthroughs for custom maps.

Actually, you can win the final battle by using Malfoy under the Sphere of Inhibition on quick battle.

I also used Malfoy; it guarantees a victory, although it's not very spectacular.
The interesting thing is that I only saw this happen for the first time on this map. If you fight a very small battle with Malfoy (for example, just a couple of dragons against his legions), then when you click "quick battle," it generates a certain number of turns (I don't know, 100-200-300 rounds?), and then the battle menu returns, you need to click quick battle again, and in that battle, I clicked "quick battle" more than 20 times. That is, "quick battle" involves a fixed number of turns in the battle, after which it returns the battle to normal mode.