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I hope it's okay to share my opinion and offer some help with your work. I'd like to focus on the creatures, as I used to be quite knowledgeable about mythology.
1. Humans: Angels and Dragons are fundamentally quite different, and it's not easy to combine them. It would be better to choose one or the other. Each has its own culture, and that's what you should base your choices on.
2. Elements (if I understand correctly): Phoenix and Mystic Eagle are essentially the same, just with different names in different cultures – Phoenix in one, Simurgh (Mystic Eagle) in another.
3. Necromancer: Fallen Angels are more associated with demons than with the undead. First, you need to define the culture of the race and its values, and then choose the units accordingly.
4. Nagas: Nagas and Kirith +, but you could add a creature similar to an octopus. I think it would fit well with the atmosphere of sea creatures.
5. Magic Chimera: An unclear race with a mix of incompatible creatures. Perhaps the information I saw at the beginning of the discussion is outdated.
6. Dark Elves: I would replace the Golems with Abaasy (Abaasy – in the folklore of the Yakut peoples, a huge stone monster with iron teeth. It lives in the depths of the forest, far from people, or underground. It is born from a black stone that resembles a child. As it grows older, the stone increasingly resembles a child. At first, the stone child eats the same things as people, but when it grows up, it begins to eat people. Sometimes they are mentioned as anthropomorphic, one-eyed, one-armed, one-legged monsters the size of a tree. They feed on the souls of people and animals, tempt people, bring misfortune and disease, and can deprive them of their sanity). And I would add an Etun (Giant).
7. Lizardmen: I can't say anything about them yet, as I need to research them in mythology. I don't think a basilisk is such a powerful creature.
8. Mountain Orcs: Giants are big, Cyclops are big, but with one eye. Instead of Giants, you could add a Rukh (Thunderbird).
I hope I haven't offended anyone or hurt anyone's feelings. If I have, I apologize. You're just trying to combine creatures that are inherently difficult to reconcile with each other. As a result, you end up with a mishmash of units in each castle.