He Deluded Himself into Thinking He Could Become an Immortal

(Invincible, cultivation, decisive killing, fast-paced, no dithering.)

He was once a filthy beggar who, through a stroke of luck, obtained a storage pouch. As he lay on the brink of death, he discovered that an immortal inside the pouch had saved him! He gradually embarked on the path of cultivation, only to discover that his origins were far from ordinary. From then on, he swept all before him as he searched for the truth about his past.