#1) use the search bar before posting. #2) this has been rejected soooo many times, it's insane.
Like fireball mentioned, this has been rejected an insane amount of times.
If you are insistent at least give us a detailed description including functions (Not, repeat NOT "Its explosive" we have enough explosives already, and the same goes for other fuctions), HOW it can be used and where it will be helpful, among other things that I cannot remember, Good day sir.
CO2 - Carbon dioxide gas. extinguishes fires. becomes dry Ice at very low temperatures. Doesn't break saves. Has a decent description. Has a decent use.
Neither the sentence nor what the sentence is struggling to say makes sense.
unless his N2 is completely unrelated to LN2, then it'll break saves.