Kinglyn's story is supposed to be fictional, a story written in a book, making it possible to exist in a different reality, a fake world, an imaginary story of someone.
But because of the God of Lexus World, the Evil God Lexus's capability to traverse different realities, he ended up recreating that world before that world was conceived as a fictional story, allowing Kinglyn to become a Chosen Warrior of the God of the Universe.
Although, Kinglyn didn't die thanks to him keeping his lifeforce alive and allowing his Mana to continue to circulate, and it's also thanks to the dark ice that he was enveloped in by Lexus that his body didn't deteriorate.
And with all of this, after Lexus reset the world again, Kinglyn was dragged along, moving his timeline which was supposed to be fake and imaginary, into the main timeline of the Lexus World, allowing him to survive billions upon billions of years.