Nitrogen (Gas) should be added, for completeness, to go with LN2 and NICE.
Uses? N+OXYG=NITR, forms TNT with OXYG and HYGN, with HYGN, forms ammonia (AMNA). If not ammonia, CAUS.
Ammonia (AMNA) is a pale yellow gas, that is flammable, and makes PLNT and VINE grow really fast. It is slightly corrosive, but since it is a base, turns ACID into WATR. AMNA+WATR=AMNA+DSTW.
@m_shinoda(View Post) Is right. This would cause many saves using power plants and other coolant based saves on LN2 to break. You need to think about the past saves, not just future saves and uses too.