Well, Lucifer is defeated!
Let me summarize. Actually, I liked this map more than the previously completed "Search for the Lost City," "Island of the Small Skull," and "Island of Edge." There are practically no drawbacks; the only misunderstanding I had, we discussed it thoroughly.
Advantages:
1. I completed the XL-sized map in 8 months, 2 weeks, and 2 days. This is a very good result for such a size (of course, it could be completed even faster, but I deliberately saved my strength for "battles" with the final enemies).
2. There were no particular difficulties in progressing: I didn't have to wander around for a long time, desperately searching for something or collecting pieces of some Dragon Power. After visiting the cartographers, the sea and then the land opened up. Everything became crystal clear, as in the song: "I know the password, I see the landmark!" :)
3. Traditionally for your maps, there are many artifacts and useful resources. :)
4. There were no "hiding places" here either: neither the necessary artifacts nor the monoliths behind volcanic smoke.
I must say: I didn't complete the optional quests because you, samatron, hinted that they are not mandatory. ;)
Special thanks for: the Angel Alliance, the Legion Statue, the Elixir of Life, the Grail, Jelu (improved my archers to snipers!)... maybe I forgot to mention something else.
The only surprise almost at the very end was an unpleasant fellow named Aznain: :) he turned out to be strong and tough, and his primary skills were even higher than Lucifer's: 69/69/74/71 and 55/55/55/55, respectively. Perhaps this is because you weakened Lucifer? What exactly was reduced: primary skills or the army? What were they before?

I have a couple of suggestions (not complaints!) regarding "making life more difficult for players": :)
1. The garrison in the north of the dungeon, guarding the black tent, could be strengthened: I overcame it easily, and no one even had time to bite me!
2. In the northwest corner of the dungeon, behind the blue border gates, there are about fifteen valuable artifacts - and only 2 of them are guarded by dragons. Perhaps it would be worth placing dragons instead of the gates or immediately behind them, so that it wouldn't be so easy? ;)
3. There, nearby, is a legion of titans, guarding the components for assembling the Legion Statue. I tried to attack them once, but then I didn't try again: there are too many of them, and I already had the statue by that time.

Regarding individual nuances on the maps: they are almost inevitable, but I try to clarify the situation because different moments are not always obvious (I periodically check something myself), and discussing them is useful for everyone who creates their own maps. Sometimes I am too direct, sorry. I wish you success in mapmaking!