Thor's story ended here.
Some readers might be wondering why it ended before he reached the highest level.
But the story had already fulfilled the original outline and main plot, so this was the planned ending.
As for the higher levels of power, they were too abstract. For example, advancing to Sixth Rank required the ability to destroy rules—that is, to destroy the world. Seventh Rank required the ability to create rules—that is, to create the world.
With my abilities, I simply couldn't write an interesting story at either of those power levels. If I only wrote about Thor at Fifth Rank, he'd be so powerful that the story would lose its challenges. The protagonist would have nowhere left to grow, and readers would have nothing to look forward to.
So I briefly described a little of Thor's Fifth Rank abilities, then sent him home for his birthday. And that was where the story ended.
As for the unresolved plot threads, I'd like to apologize. They were a result of my own shortcomings as a writer. I forgot about some of them because I'd left them dangling for too long, while for others, I couldn't think of a suitable way to develop the plot. So they had to remain mysteries.
As for the Diary's origins, they were tied to Sixth Rank, and explaining them properly would have brought us back to the previous problem, so I didn't elaborate. I did give a little explanation in the book: if the Death Herald Demon's Fate Line was an observation—from birth to destruction—then the Diary was a rehearsal, a prediction of how things might develop, a matter of probability. That was why Thor could still fight for a glimmer of hope even when every entry in the Diary said "death."
Diary is the