Wiktionary
deathlessness
n. the state of being deathless; eternity
Usage examples of "deathlessness".
Graydon accepted that deathlessness as fact Studying Kon, he could not doubt that the science which had effected that monstrous blend of man and spider was entirely capable of performing the lesser miracle of indefinitely prolonging life.
But the wise, beholding deathlessness, seek not for the enduring among unenduring things.