Before God created the world, before He even conceived the nine choirs of angels, He brought forth the Grigori. These creatures are distant relatives of the children of fire. Perhaps it is even appropriate to call them the mightiest of all angels.
And the Lord said unto the Grigori, "You, most beloved of Mine, go forth and watch over the children of clay. Let them be safe in the knowledge that you will protect them."
To this Shemihasah, first among the chiefs of ten, replied, "Oh Lord, we, the Watchers, will do as you command, for our hearts are filled with love for You and Your creation."
But the task was harder, by far, then the Grigori imagined. At first they taught man wondrous things: how to fashion weapons, how to work the land, and how to navigate by the stars. But they became so enamored by the children of clay that they were corrupted. They lay with the sons of Adam and the daughters of Eve. Their abominable offspring were the Anakim and the Nephilim. It was this transgression which God could not bare. He cast them out of the heavens and told His angels to hunt them and their progeny
And still they roam the earth. What plans they have are a mystery to us. They go on lusting after mortal flesh, and their progeny reek havoc upon man.
The Grigori were given knowledge to pass on to the children of clay. All science and technology stems from them. Even in contemporary society they go on influencing mans development. Most scientific breakthroughs and technical innovations are caused, in part, by their meddling. It is this very nature that makes them so dangerous. For they do not have the same restrictions placed on them as other angels do concerning technology. They can understand and use it as well (if not better) than the children of clay. This combined with their extraordinary celestial abilities makes them virtually unstoppable enemies.