The most challenging campaign.

Nicholas the vampire and Isabel the enchanted are the most difficult for me. I am currently playing the fifth mission in the campaign for Raileigh in the gold edition; in the easy difficulty of the fifth mission, after storming the first castle, you are given the Astral Gate spell. Here, I have already destroyed two castles, but I haven't received the spell, and without it, it's difficult because the garrisons there are very strong. I don't understand if it's a bug or if the walkthrough has changed. In the gold edition, many things are different. Added after 4 minutes: And playing as a Necromancer, I found it surprisingly easy, even on the hero difficulty. There were no problems at all with his ability and the amount of undead around.