A gaseous Material that evaporates from freezing liquid, bleeds from certain enemies (such as Jäätiö), and is produced by the purple propane tanks found in the Snowy Depths and Hiisi Base. Freezing liquid may linger without fully evaporating, creating constant trails of freezing vapours.
Creatures in contact with the gas take significant damage while exposed to it, depending on how many pixels of the gas they are in contact with. Being caught directly in the explosion of a propane tank will often lead to a quick death from the high concentration of freezing vapour.