Nova Subterra is an alternative genome for Creatures 2 Norns created in an attempt to combat OHSS, among other problems. It was made by LummoxJR, with help from Chris Double (who designed the modified brain structure), and was tested by several famous members of the Creatures Community. From the genome's website: A similar project resulted in the Canny Norn genome. The Norn Underground is down, but you can still get Nova Subterra from the Internet Archive.