Inferno – “A fitting image for you” [Campaign 5, Mission 2]

Okay, I guess I spent too much time there. At the beginning of the campaign, I took the first Haven castle. Then, relatively slowly (I don't remember the exact time), I took the second castle and defeated another strong hero. After that, I captured Lady Cordelia, and the gates opened, and a Necromancer appeared. I defeated him too, and that's when all this chaos started. Thanks, I'll try to replay and deal with them faster, before the Necromancer gathers such a large "staff" in the castle. Yes, there's a passage that leads to a single Necropolis castle, but I haven't gone there yet. Thanks.