Info for the Mezin is up on the site now:
"The Mezin are a brotherhood of Grigori determined to rule Earthafter the next Evolutionary war. Although its origin remains clouded in mystery, according to legend, the Mezin was founded by a handful of Grigori around 6000 BC, with the sole purpose of preparing for the next Evolutionary war.
After centuries of service to their home world, the allure of controlling humans became overpowering. They abandoned the commitment to their creators and took up rule over several tribes of humans in North Africa. The Grigori were veritable gods among their followers; they were powerful Wielders and practically immortal compared to humans.
As the centuries marched on, it became clear to the Mezin that they would have to prepare for the return of their creators, either by fleeing certain execution or by confronting their former masters. The first phase of their rebellion required the elimination of all other Evolutionaries on Earth still serving the Seraph and Ophanum. To that end, they scoured the darkest corners of the planet, assassinating as many as they recruited. As the brotherhood grew, they saw an opportunity to seize control for themselves when the Seraph and Ophanum left once more.
During the 21st century, their primary nemesis was Van Mantra, whom they hunted relentlessly. Their goal - to quiet Van’s warnings and prevent humans from knowing of their world - would once again become the battlefield for the Seraph and Ophanum. Some speculate that the Mezin allied themselves with a group of Amunnaki assassins who attempted to carry out a contract on Van and his family.
In 2280, the Mezin are a feared and reviled group of Evolutionaries led by the rarely seen Vedor Mezin, one of the brotherhood’s founding members and a ruthless power-seeker."
My theory was kind of right, they ARE Grigori, and they WERE sent to scout for the Evolutionaries, but they’ve defected or so it seems.