Hilarious Cultivation of Immortality: I Have an Unreliable System

On the road to cultivating immortality, others relied on secret books and pills, but he relied on an outrageous system! The protagonist is fully expecting to embark on a journey of cultivating immortality against the heavens, but the system rewards him with a strange style of painting: when others get a magical weapon, he gets the "Fart Technique" to ward off enemies, and when he farts during battle, it also has special purification effects; when others learn peerless magical skills, he learns the "Turtle Style Bone Shrinking Technique", and when in danger, he shrinks himself into a ball and rolls around on the ground. At every critical moment, the system either crashes or issues bizarre tasks, such as competing with monsters on a full moon night to see who can tell the best jokes. But such an unreliable system actually allows the protagonist to make mistakes, step by step towards the peak of immortality that makes people laugh and cry, and stage a legend of immortality that is full of jokes!