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Why are you so fixated on hydras and other creatures from the Dungeon faction?! In my opinion, they all look quite good. Why make everything like in the third game? It's better when everything is original; the developers essentially created a new Dungeon with new creatures, and in my opinion, the Dungeon in the fifth game is much better than in the third. And if you make even more creatures even cooler, then the Dungeon will be absolutely unbeatable, and only the Necropolis faction will be able to stand against them, and even then, only if they raise an entire legion of corpses:D.
And in general, the original idea for almost the entire Dungeon faction was taken from Robert Salvatore's "Dark Elf" books; even the design of the castle is roughly similar to the world of dark elves from the book. So, I think we should leave these sacred creatures alone.