Undeathable
To be 'Undeathable' means to be unable t obe death'd by any means necessary, making said being who currently is not undeathable means to have shared thy undeathableness with another being on the same plane
"I tried to kill him however, he claims it is impossible for him to death'd for he is 'undeathable' "
Undeath metal
Undeath metal (or Christian death metal) is a genre of heavy metal music that is stylistically closet to the sound of death metal, but those artists are either directly against satanism prevalent in death metal, even those artists lyrics are about rape & cannibalism, or promote Christianity in their lyrics and imagery.
Lightforce Is An Undeath metal band