Arnold, a farm boy, travelled to Uqbar's capital city with a childhood friend, but was sold as a slave by him. While his boyhood friend achieved enormous success, he spent his life on the streets. He swore he'd murder him, but he couldn't in his current situation. Fortunately, he came upon a shop and stole a book from there in the hopes of making some money by selling it; the book was about Genghis Khan. He opened it out of curiosity because of the odd name, and it came out with a person capable of slaying a tiger with just a look. He was terrified, but he realized it was a soul. He smirked after learning about Genghis Khan.
He knew that the most fortunate star had aligned in his favor, and that his adversary would soon face his vengeance.
This is the story of a boy who was raised by the cruelest king on the planet, who wreaked havoc on his world.