"The Will of Ashan" - "Heart of Darkness" [2nd campaign, 5th mission]

, I'll try replaying it – I'll let you know.

No need to do it because of me; maybe someone else will come and give me a hint, and I've already replayed this mission for the third time, it's a pity that it's been unsuccessful :(
But on the third try, the hero had 43 liches by the second week :D

Added after 2 hours 37 minutes
Well, I really don't know, I made 4 heroes above level 20 using the Sacrificial Altar, I slaughtered a bunch of infidels :))) - sent them to the portals of the Haven and the gates near the spirit still don't open =((((
But I learned a big advantage of playing as Necropolis, when you have many heroes! They increase dark magic, probably not news, but it's very new to me =)<