Mods won't add it to the game, you have to use mods
sorry for being late, but it would have to become HYGN at -252 and it would burn with PLAS explosively when combined with LOXY and burn like FUSE without plasma when uncombined, it would also be able to be hypergolic with acid like DESL and to an extent OIL and NITR, it would also create pressure like LOXY, thats all i can think of really oh and like LOXY be liquid at room temp with extreme pressure (~100)