…It is said that the Ysar could move through the world like light upon glass. That they could travel to the heavens to gaze upon the burning stars as their own braziers. That they finally looked upon the faces of their Gods and knew something terrible—and despaired… — From the Journals of the Acheran, 445 AT
According to legend, the Ysar were an ethereal, magical race that could take the form of light and travel the cosmos. They were reputed to be immortal, or close enough for mortality not to matter any longer.