Van
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If you have skeletons + ducks and a native troop from another castle (not a Sylvan one), for example, from a Rampart, then you get -2 morale. In that case, it's better to be Mephala with expert leadership. :)
By the way, I recently noticed that either the art that provides anti-morale wasn't working on my old Platinum (obviously a bug) or the 4th slot in the hero's artifact wasn't working... now I'm playing with a different Platinum.