yes, it's a must-have ability, I completely forgot about it. And it also protects against deadly cold, right? And there's no need for complete immunity to magic; making it focused on brute force is a dead end, especially for multiplayer. At most, immunity to water and mind control (although, besides subduing a solo boss, nothing else will work properly).
Regarding the list of abilities, if I remember correctly, there are creatures in the game with 6-7 abilities, and it never seemed particularly unaesthetic. But adding more than 5-6 abilities is impractical from any point of view.
Well, if the creature's description is appropriate, then it's possible... it's like that joke: "Do you want checkers or to get there!" :smile13:

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1