samatron, I also wanted to add something about Lucifer. As the saying goes in another song: "the last battle is the hardest." Maybe it wasn't the hardest in the end, but...
Lucifer is quite the trickster: he recruited phoenixes and azure dragons into his army. I wonder what he used to lure them? :)
So, I had an interesting experience (and how about others who have played through it?): I repeated the attack on Lucifer about 5 times, and the same thing kept happening. I have a speed cloak, an alliance of angels, and the archangels are divided into 2 stacks. It seems like my turn should be first. But the archangels would freeze in fear (both stacks!), and the initiative would pass to the enemy. :( 4 times I retreated because such a start was not inspiring at all. On the 5th time, I tried to fight anyway - and won, although the losses were significant in the end, but the army is no longer needed for anything further, and if I had to fight again, I would have waited, especially since reinforcements would arrive in a day.
In general, it wasn't so much difficult as annoying: if it weren't for the fear of the azure dragons, I would have cast berserk (by the way, thanks for that, I found a scroll!) and the battle would have been almost a fun game. For example, I defeated the crystal dragons in the center of the dungeon using berserk.
By the way, although expert fire and earth magic were very useful in the walkthrough, in the last battles on the magic fields, it doesn't matter what skills the hero has learned: all magic is expert level.