He was once a time traveler, and now he is the embodiment of destruction, Dark Lucifer. In the eternal madness, he only managed to gain a moment of clarity.
This moment is not enough to redeem oneself, but it is enough to set up a situation that spans time.
He turned his broken reason and all his hopes into a system and gave it to his initially confused self. Every task issued by the system is a lesson he learned from blood and fire; every prompt is his last roar before falling into eternal darkness.
He set tests for himself and paved the way for himself. When the past "I" grew up step by step under the guidance of the system, he, at the end of time, was smiling to welcome the final devouring of madness.
This is the only variable written by a sinner for himself and for the entire universe when the end has been decided.