Without having been asked, Illyana collected his chosen materials into her hands and began to move back in the direction of the circulation desk. "There is no discernable pattern to the timing and frequency of the portal appearances. Yet there are some constants. They have all been worlds that sustain intelligent life, for example, and we have had means of common communication in each instance. Once they appear within the threshold of a room, they remain for several weeks on average."
no subject