I don't know who found it difficult here. I always choose Necropolis when I hear "difficult map" :D I'm also looking at Rimpel :D, but he played more for speed, and I play for enjoyment.
On map 313, there are 90 Lord Vampires, 4350 skeletons, and 4 angels. Who can stand against that? This was on the respawn point on the lower left. I collected skeletons with one hero on auto-battle. I don't even feel like finishing it. It's too easy.

They need to fix Necromancer somehow ;)

Honestly, I don't know how to balance Necromancy without completely removing it.

So, think about it :D