Surviving the Doomsday: I Am the World's Number One Magic Cultivator

[Determined to kill] + [Villain] + [Dirty] + [Do whatever you want] The countdown to the end of the world was 100 days, and the system sent Sikong Yi a bunch of forbidden magic books. While others were still trying to survive, he was practicing the Ten Thousand Soul Banner and the Blood Demon Kung Fu. Zombies? Finished practicing! Zerg? Finished practicing! Cthulhu? Follow the exercises correctly! A wild beast? Finished practicing! No matter what kind of monsters you are, let me put them all into my Ten Thousand Souls Banner and use them for me! No matter what evil gods you are, they are all refined into my body and become a part of me!