Walkthroughs for custom maps.

I agree: besides stats, how do you defeat an enemy if they also have a speed advantage, and all we have as "serious arguments" is the Clone spell? Plus, the enemy raises their Archdevils using Sacrifice.
That's why it's bad when there's no contact information for the author or a link to a forum where this map might have been discussed – it will be difficult to find out what was intended and how things were supposed to work.
However, based on the save file, the map looks interesting: the genre is clearly RPG, and there seem to be some clever ideas.

I took a look in the editor. The message from the 4th day, translated by Google, is utter chaos:

"In Sitterswom, they expressed their bewilderment...
"In the center of one of my trips (from 2 to the attack on the castles), I met a hermit who had a strange vision... He spoke in a very mysterious way, but I remember something like this:
"One day, vyendra
or will not have his aszures
in Ce, in a bad state,
salvation vyendra aylleur
not a god pestit, who knocked on your door,
Mays Pluto, his boss, Quy, translate my words..."
"I shouldn't understand this, and the result becomes even stranger... Finally, I still (But what the heck! You've turned all red! :-)
"Sy OUAT ne faitroux, alort OUAT dantroux in the FALL..."