Curious. But I would need to know more about Yith. As for forms, it being a cold place, one of them must surely be a rolling mass of transparent sludge, leathery on the outside with many brushes and feelers and with eyes and stomachs floating within. The ball rolls over any nutrients it can catch and absorbs them for such length of time as the stomach acids require; if the acids are ineffective, the stomachs regurgitate. This way the form can also pick up junk and clean passageways. It communicates telepathically, but only in nouns.