That’s it! I finally finished the Walkthrough today!
The guard at the scroll is very powerful (probably to prevent enemies from taking it): I didn't defeat it on the first try, but I succeeded on the second. Everything else is simple.
Was artillery not useful? -) There are many things on the map that may not be useful in the game -) And I repeat what I wrote above. Everyone has their own preferences in the game. Some collect all the magic, others develop other skills. You can never please everyone -) I don't want to change anything here.
Regarding the Grail in the Dungeon... The computer player will no longer have an advantage. I have disabled the ability to build a Grail in the castles.
The guard at the scroll is indeed tough, but it turns out to be quite defeatable.
I'm glad you managed this "easy" map. An outside perspective is always interesting. There is something to work on. I hope to play your masterpiece soon, which you wrote about earlier.
Thank you again for the detailed comment. Good luck.