Chroma: To survive in space without a space suit, you must be a polyelemental that manipulates and controls at least ice and void. You must also be a ice god AND a void god. I can survive in space without a space suit since I'm currently the panelemental go- wait a minute! Blizzard will die! Mystic!
Mystic: Yeah?
Chroma: Do a fusion with Blizzard!
Mystic: Okay!
Blizzard: Help! I can't breathe in space!
Mystic: Fusion time!
Mystic + Blizzard = Myssard
Myssard (Blizzard's Side): I can breathe now!
Myssard (Mystic's Side): We should get back to Earth.
Myssard (Blizzard's Side): Okay.
*Myssard goes back to Earth and turns back into Blizzard and Mystic*

That explains why xe doesn't die because of the cold space but what about losing all the oxygen on xem lungs?

I meant xe was only invincible to ice related deaths.

So if a nuke exploded Xe will survive

Xe is invincible. I will explain in a few moments.