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"For my Lord and Master, I will do anything! Even if I have to tear apart my soul to release the True Demon dwelling within me!"
Marchosias roared, as his humanoid shaped body took a sudden change. He was covered on white and blue fur, his head transformed into that of a huge wolf, he gained giant paws, his posture became quadruped, and he gained a long, wolf-like tail.
Indeed, Marchosias within the Book of Demons, Goetia, was known as a "Fire-Spitting Demon Wolf" that had wings and could spit fire everywhere, it was a wild beast with no intelligence.
Yet the Marchosias everyone was confronting was intelligent, and knew how to fight with his bare hands, and didn't even look like a wolf!
It didn't made sense, isn't it?
However, this was because Demons that grow strong enough possess what's called "Dual Natures", within their Souls rests the true embodiment of their Demonic Powers.
Check "The Protagnist's Sister Is Actually the Strongest"!