Delusions of Immortality

He thought he was a time traveler and wanted nothing more than to return to a warm world with loving parents. An immortal told him that as long as he killed another immortal, he would be able to open the way home. After successfully killing the immortal, he was shocked to realize that his memory was false and he was just a pawn. In endless anger and despair, he sacrificed the entire real world just to return to the home that never existed. What he faced in the end was eternal nothingness.