Has anyone played through Len’s mission in Heroes of Might and Magic II?

Sorceresses are not among the starting heroes; they are purchased in the tavern. And the starting conditions should be generated in such a way that the Necropolis doesn't have powerful offensive magic.

I also bought them in the tavern. After gathering all the fairies from all the Sorceresses, as well as from the castle, I only had 40 fairies.
The first three Necromancers only have the speed magic spell. But the second wave of Necromancers always comes with the Cold Ray spell.
It seems that this mission doesn't have a universal walkthrough, and for the most part, everything depends on luck.