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The worst possible outcome happened, Mammon activated his special ability, the very power that Blake didn't want him to activate.
The reason why Mammon was so terrifying to even Asmodeus was because of his Soul Parasites, they were a unique power the Archdemon of Greed possessed.
It allowed him to parasitize the souls of others and slowly devour them, parasitizing them and turning the subject into a demonic aberration.
Sometimes, when he would choose a suitable vessel, he would go out of his way to devour their souls completely and turn them into his second bodies, gaining tremendous power out of them.
But sometimes, he would prematurely trigger the Demonic Power dwelling inside the target's souls, making the Demonic Soul Parasites completely transform the bodies of those parasitized.
They would turn into Demonic Aberrations, Mammon's own creations, his own army.
And right now, Blake had realized this too late.