How do you even beat this map?
I've been playing Heroes since 2000. I've completed everything possible on impossible difficulty. All the most difficult maps.
But I always abandon this one around the 3rd month because a purple Necromancer with a huge army shows up.
You can, of course, hide in monasteries, retaking your castles. But he has Flight, Dimension Door, and Town Portal. By the time you take back one, he's taken three. He becomes even stronger, and you're stuck in a miserable existence in a monastery.

Please tell me, step by step, how you beat this map.
Even better, post a walkthrough as described in the first post of the thread.

I find it hard to believe that this map can be beaten (specifically VERSION 2.4!!!)
Maybe we're talking about something else?