How is Dark Messiah connected to Heroes of Might and Magic?

We might have exaggerated a bit about Leana. I already mentioned this mistake in one of my replies in this thread. Lena isn't exactly a mage... She prays to Elrath, which already casts doubt on her origins. I heard she's the last of the Falcon clan. She only has a mage uncle. And regarding her being annoying, that's just a joke! XD The essence remains the same. Xana could very well be the daughter of Agrael and Biara. This could have happened even before he met Isabel. That's the whole point. And how it happened is a completely different question.
Besides, the idea that Isabel annoyed Railag wasn't my invention; it was Xana's. Although, if you ask any of the fans about this, many will say that the queen turned out to be quite bad. In my opinion, without Isabel, the game wouldn't be as interesting. Thanks to the touching love story of Railag, who lost everything to save Isabel, the plot became very interesting. I felt incredibly sorry for the necromancer. He's my favorite character in Heroes 5. But I held a grudge against the queen because of her "blindness." She didn't see anything right in front of her. People were dying and being killed because of her, and she continued to believe that everything was fine. And she's not a good politician either...