I Am Invincible in the Fantasy World of the Apocalypse is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

In a world where corpse cultivation thrives, Chen Yuan is betrayed by a villainous person. He unexpectedly awakens the All-Things Extraction System, which enables him to extract cultivation, techniques, spiritual energy, and more from any deceased entity. "So, if I kill him, his decades of cultivation will be mine?" With the system's support, Chen Yuan embarks on a journey of battling monsters, levelling up, and making significant allies, all while facing various trials. Unbeknownst to him, behind each trial lies a vast conspiracy woven specifically against him...