Zwarst Xanathos

 is the mysterious being whose spirit was sealed in a strange Holocron found in Greece on Earth. It was his spirit that corrupted Kazeem and turned him into his new apprentice as Lord Teras and created the Order of the Templars, introducing darkness to the galaxy.

History
"While I was in that... prison, he showed me things: where he came from, the things he had been through, and his desire to lead his people to a better and dark future! but instead of embracing his power they turned on him! They disgraced him and disowned him!! But you see therein lies his failure: He tried to reason with them as opposed to what he should have done, well I shall not make my masters mistake, I will see that every last one of you humans suffer for what you've done to me!!!"

- Monstrosity on his time in the Holocron with Xanathos