The Hollow of Tarsilja is a spatial gate piercing the moon Tarsilja. How it came about and when it was built has yet to be learned. In 734, a persecuted people of Throndar, the Eenkai, used the Hollow of Tarsilja to leave Asteraoth. They traversed a great distance of the void in a very short time, ending up near the cratered world Gebs Rain. There have been no other known uses of this inter-system rift since that time.