In fact, High Inquisitor Jerec was a Mirialan, an extremely rare species. They were a human subspecies, with little difference from humans and no reproductive barrier between them. Thus, during the Galactic Empire era, they were one of the few species not subjected to Human Supremacy discrimination.
The Mirialans' greatest characteristic was that their eyes had completely degenerated. Looking directly at them, one would find only eye sockets on their faces. However, Mirialans generally used masks or glasses to conceal this, making it almost impossible for others to tell.
Though they had no eyes, Mirialans possessed a very unique Force Vision. To them, the world was made of the Force. Thus, they could often see the essence of the world. That was why Jerec wore those ridiculous-looking glasses. Moreover, his glasses were more advanced; not only could they enhance his Force Vision, they could also perform optical imaging, allowing him to see what ordinary people saw.
Of course, this trait also made Mirialans disdain so-called profit and luxury. At the same time, they did not care about so-called honor or empty fame.
In fact, Mirialans had always been major members of the Jedi Order. Many had joined it and fought for the Galactic Republic, precisely because their general disposition coincided with the Jedi Order's beliefs.
Lucien Draay, the Jedi spirit possessing Tang Xiao, had one-quarter Mirialan blood. That was why, after losing his eyes back then, he had instead been able to see the essence of the Force.
Jerec had also once been a member of the Jedi Order. He had studied under Jocasta Nu, curator of the Jedi Archives, and worked in archaeology. Later, during Order 66, he escaped disaster because he had been investigating Relics in the Unknown Regions. But after sensing the sacrifice of countless Jedi Knights,