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Inspired by Andrail's wolf mod, I decided to try something similar. It seems to have turned out quite well, so if anyone is interested, feel free to download it.
The mod replaces Hydras, Cave Hydras, and Dark Hydras with Manticores, Lamassu, and Scorpians, respectively. The Manticore slot is filled with the "Necromancer" creature.

Note: This mod is NOT intended for playing campaigns or pre-installed scenarios. It is strongly recommended not to combine it with other mods that modify the "Manticore," "Hydra," "Chaos Hydra," and "Dark Hydra" creatures in any way.
Thank you, and enjoy the game.