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Under a new alliance with Moloch he was convinced by Malagarde (who worked for the entry of another galactic force from the realms of Geryon and therefore Asmodeus that if he showed defiance, Asmodeus would respect him and absolve him of all crimes; instead , he was deposed and his galactic king of Malagarde, who convinced him to join in a few last battles.

Being that it was to begin with, he became the archdivil of the Malbolge galaxy, following with an alliance with Baalzebul he was allowed to hold his position, but his body was transformed into a giant slug.

In short, all of the arch-divils were forced to accept Asmodeus as their superior and he reassured them of potential usurping capabilities while dramatically reminding them of their position.

This being why Darkness accepted Asmodeus' entry into his conspiracy that deposed and subjugated Geryon's realms was a mystery, with at least three possible explanations being accepted for being able to use and subjugate them.