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If we look specifically at the abilities, I tested the creatures themselves; they all seem fine and fully correspond to those in Warlords of Might and Magic in terms of parameters, with a few minor exceptions:
1) The Dracolich cannot be given Dragon Breath; more precisely, it doesn't work because he shoots projectiles, and shooting is his specialty; you can't remove this ability.
2) To ensure consistency, perhaps the Dracolich's HP should be reduced from 1500 to 1200 (I somehow thought he had 1000 base HP instead of 800), but initiative should be added to both the Blood Dragon and the Dracolich.
3) For the Dark Dragon, I gave him General Scatter, Berserk, and Subjugation, as well as a lot of strength and abilities. He flies well, but the AI is somewhat dull; when he needs to deal significant damage and simply eliminate a creature or hero, he starts using Subjugation and Berserk, i.e., where only one hit separates victory from defeat, the AI turns that into a loss. Therefore, I will probably remove Subjugation and Berserk from him, leaving only Scatter – he uses it en masse, only when he can’t attack directly. In the hands of a player, this dragon will certainly become weaker.
Also, there might be some inconsistencies in terms of experience and creature strength; I didn't pay much attention to this, but it would make sense to adjust it.
As for a mana-based dragon, such a thing already exists; it's called MystoDragon. Here's a link:
/topic/at/1184055/. I don't know who created it; it was taken from an English website