Which Might and Magic universe are you referring to?

Necropolis is Necropolis. First, the Death Knights were replaced with Undead, which doesn't make much sense, but whatever. Then they were changed again to some Lamas, and the Bone Dragons were replaced with Fate Spinners, and here a question arises - why? In the Castle of the Dead, dragon-undead fit better than mutant women. Lamas are just some incomprehensible thing; if Death Knights clearly represent undead cavalry, then what are Lamas? Where does such a weird creature live? They were made just for the sake of it, as if to say, "we're not just copying everything, we can do this too!"

Mutant women fit no worse than bone dragons.
As far as I understand, the Greek myth about Arachne, a girl-weaver whom Athena turned into a spider so that she would weave forever, was taken as a basis.
http://ru.wikipedia.org/wiki/%C0%F0%E0%F5%ED%E0
And in the sixth game, the Necropolis is positioned as the Cult of the Spider, so everything is connected.
And in general, the spider as a symbol means: What is a Spider
Unfortunately, there was no place for dragons.
Well, and the origin of the Lamas is explained in detail in the Necropolis campaign itself. There, you also get the Staff of Sandro as a reward.
Lamas is an unsuccessful experiment by mages to create a superior breed of beastmen by unnaturally combining a human (mostly slaves and criminals) and magical creatures (in this case, a manticore).
So, it wasn't done just for the sake of it, but rather as a well-thought-out concept.

Oh yes, green-skinned orcs are a Blizzard thing, and they can be sued for it. But in the original Heroes universe, only goblins were green, and orcs were always brown, except for the third game.

Besides, since the history of Askhan is unique, goblins, orcs, and others all have a common origin in terms of how they were created, not in terms of species - that is, they all have the same mother (mages), but different fathers (demons, elves, beasts, etc.), which gives reason to consider them a race.

Oh yes, I remembered.
I read something about the M&M universe a long time ago on Demilich's website.
It seemed boring and depressing to me. I couldn't get through it.
So, it turns out that Askhan appeals to me more. Therefore, I think that they are separate things.
In general, I think that Askhan is cooler because he is at least interesting to me, but Xeen and others are not.

(yes, Hel (or is it still Xeen?),

well, if you stick strictly to the rules of translation, as he likes and always advocates for, then it's "Zel". Otherwise, he'll say again that the translator is bad, a fool, and doesn't understand anything. :))))