I heard that it was implied that the nidya were related to the hissho, but never got any concrete evidence, until now. This picture is from the artbook of endless legends, and right there on the back of the nidya, is the Hissho symbol without its lower part. This is pretty good evidence that the Nidya are related to the hissho, Most likely being the survivors of the grey owl after they were stranded on auriga. does this mean that the hissho are the second species to be seen in all 4 endless games to date.