Yes, that's true, and I also turned the contents of the Knight's Castle into undead for good measure, just in case. First, I maxed out Markel, and then I only sent Isabel to the garrisons and the last castle. And I gave her an undead army, along with 2 artifacts that increase the experience percentage, because otherwise she might not have reached the required level. But she also reached level 26 without any problems. Of course, an undead army is more effective with a Necromancer than with her, but that's a minor detail and a matter of personal preference, depending on when and how you level up your heroes.:smile33: