The Land Of Beast Taming : My Pet Can Revert

Hughes Andrew traveled to the world of beast taming beasts and acquired a monitor lizard as his pet. As a result, he was subject to much mocking and ridicule from the public. <Hughes Andrew owns a worthless monitor lizard!>
Just as Hughes Andrew thought it was a lost cause, he managed to secure the Beast Taming System. The beast would increase its power every time it reverted to its roots. It would turn into a truly mythical beast.
Hughes Andrew looked at its own monitor lizard. A string of information appeared on the system.
<Beast Revert System : Monitor Lizard : Level 1, Condition : Healthy, Aptitude : 1 star, Revert status : Possible to revert, ultimate status could be reverted to the black dragon, Niederhawk!>
Hughes Andrew was stunned. Niederhawk!
The black dragon was entangled in the root of the tree of earth. It was the symbol of disaster and calamity. It was a beast feared by all gods. This beast could easily destroy anything in the world.
Furthermore, Hughes Andrew could also revert an earthworm into the mightiest form of all snakes. In the mythic world, this snake could destroy nine worlds. It was called Yemengade!
Hughes Andrew was also able to transform a wolf into Fenrir!