Mortal Cultivation: Refining Poison, Refining Gu, and Refining Heaven

[No system + non-transmigration + mortal cultivating demonic arts + using lightning + poison refining + dark fantasy + decisive killing + self-interest + no female lead (has cultivation tools) + consuming spiritual roots] Traditional cultivation of immortality, the protagonist is ruthless, and it contains some special killing elements. The pace is faster than that of a normal, ordinary stream, and it's less verbose. Spiritual energy is poisonous; immortality is a curse! Li Wujiu possessed the remnants of the Five Elemental Roots, making his life as worthless as an ant's. Until he fortuitously melted the "Heart-Eating" poison into his body and obtained the "Secret Record of Poison Refining". Since spiritual roots are formless, he forged a pair of poisonous hands to probe the dantian and peel away spiritual roots alive! The path to immortality is blocked? He then proves his Dao through killing, seizing the foundations of others' paths to mend his broken body! —— Years later, Li Wujiu stood at the pinnacle of the human realm, his white hair dancing wildly. Beneath his feet lay mountains of corpses, and behind him, a sea of ​​infamy. Faced with the curses of countless immortal sects, he chuckled: ...