I Used Yang Shou to Fully Stack the Buffs of Cultivating Immortals.

Jiang Che hesitated for thousands of years during the Mahayana period and was still unable to ascend through the tribulations. He simply spent all his efforts to refine a technique called "The Art of Seizing Heaven and Longevity", which can exchange Yangshou for skill. By some mistake, he was reborn as a little useless turtle. He thought he was about to become an immortal, but instead he became a being that the entire world of immortality couldn't stand.