It wasn't reincarnation?

One day I found an unknown novel on my desk. It had a plain cover with no title. I didn't know from where this book had come. Intrigued, I started reading it. It was the story of a character whose name was never once mentioned in the story, a HERO who killed its own people, a HERO who sacrificed itself for one who destroyed his world. It was a story of a failed HERO. The day I finished the novel.......... something happened and I ... maybe died? When opened my eyes there was a translucent window in front of me. [ A soul?? souls?? ... from the dying world complete the trial to enter the cycle of rebirth or be destroyed.] LK here!!!! If you like the novel pls leave a nice review to motivate me and also if you find any mistakes pls mention them. The cover pic is not mine.I will change it when i have a proper cover for it.