Czarnian’s constantly regenerate as if they have had the spell regenerate cast upon them, additionally due to their hardy nature they can survive injuries as severe as decapitation, from the state, they can regenerate their body over a period of two hours. If a Czarnian is knocked unconscious via elemental damage, they will instantly fail two death saving throws. 

Due to their travel through space over the millennium they have adapted so that they do not need to breathe when traversing through outer space, nor suffer negative conditions from travelling through the cold temperatures of space with no space suit.