A THREAD FOR NEWCOMERS!

Heroes 3, I've completed the campaigns, including "Birth of a Barbarian," but "Ascension of the Necromancer" isn't activating. Could it be that I need to complete the previous missions with a specific condition?

The most common mistake is starting each campaign from a new game.
After completing the first campaign, be sure to save! And when you start the next one, do so by loading the save file. Go to the save, load it, and then choose the other campaign.