( Night Sky keeps watch behind him, making sure nothing approaches from either the woods or the snowy border beyond. )

Could be a holdover from when more of the natives used magic? Then when everything went to shit some of the portals dissipated or moved. I figure there should be more somewhere, but I haven't found any here.

Could be they're for getting closer to the segment borders? Might be one in the winter half that goes to spring or something.