Naruto: Immortal Power Overload

Lin Rui traveled to the Land of Rain at the end of the Second Ninja War, and had an alien crystal called "Starfall" embedded in his spine. In this world where the limits of chakra and blood determine class, he is a mortal without "qualifications". But he became the most violent predator in the ninja world. The crystals in his spine were like an eternal furnace, forcing violent natural energy into every inch of his bones and muscles. This energy, known as "immortal power", is a miracle in the eyes of others, but in his body it is magma that tortures his body day and night. Starting from the drainage canal of the Kingdom of Rain, he led a few refugees to find a way out of the cracks between the three major countries. He wants those powerful men who are above to understand: when a mortal masters the power of the immortal and sharpens it into a sharp edge, even a ninja will bleed.