Cultivation Begins as a Demonic Sect's Cauldron

After transmigrating to another world, Wu Qi finds himself from the start as a furnace vessel for a demonic sect, on the verge of dying from weakness. He roars in defiance: If mortals can cultivate immortality, and Taoists and monks can do it, why can't a furnace vessel?

P.S. Cultivating immortality doesn't necessarily mean practicing the Dao.