Starting with the consumables of the Demonic Sect, one can barely achieve immortality.

Yan Cheng couldn't understand why everyone else who transmigrated to another world either became a sect's prodigy, living a life of glory, or a carefree immortal, accompanied by beautiful women. Why was he the only one who became a lowly zombie at the bottom of the Demonic Sect? Being a zombie was bad enough, but a zombie that could be used as raw material for refining at any time. Oh well, what's done is done, let's cultivate first. Then he discovered that the mirror in his mind seemed to be able to record all the cultivation techniques he saw, and even deduce and complete incomplete techniques? From the "Yin Corpse Walking Evil Technique" to the "Upper Yin Heaven Corpse Path Chapter", the "Green Duckweed Broken Sword Chapter" to the "Eight-Leaf Floating Duckweed Sword Scripture"... until one day Yan Cheng looked back, he realized that he had become an enlightened immortal in the eyes of thousands of true cultivators, the most sinister one in the Taiyin Immortal Sect. Looking up at the myriad figures of immortals and gods in the clouds, this Heavenly Emperor, the Floating Sword Immortal, and the strongest sect leader in the history of the Immortal Sect merely smiled indifferently: "This Venerable One upholds the correct laws to serve the Immortals, and the Dao lineage rises like the bright moon..." "Which fellow Daoist just now dared to say that my Dao is a heretical and demonic sect?"