When the most powerful Beast Controllers found the Archivist, they started to question him and eventually attacked him.
There had been 20 Beast Controller Emperors back then, and each one was interested in testing the Archivist's power one by one.
However, when they realized that none of them could win on their own, they started to harbor thoughts of banding together and just killing him.
The Archivist had lived a very long time by then, and he knew all of them.
The Beast Controller Emperors had dominated the world and had finally become the sole rulers. After being suppressed for so long, they felt unstoppable.
They were the most powerful beings in the world!
They could do anything!
When the Archivist saw their greed, he decided to negotiate.
He would tell them the locations of the legendary beasts in exchange for his safety.