The most challenging campaign.

Has anyone else encountered a similar bug with Necropolis?

I completed it without any problems on the Warrior difficulty. On the Hero difficulty, I spent about 30 minutes dancing around the elephant, then ran away when it chased me. Finally, I waited for it to move north. I immediately rushed to the Dungeon. I didn't even break through the Fortress. Later, when the elephant captured the Dungeon, I returned to the surface and collected everything I hadn't managed to get before.