The World Is Doomed, I Will Become an Immortal Through Cultivation

Doomsday and fog descend on the earth, and the world loses contact within 7 days. In a desperate situation, He Fan became the host of [Void Fragment] and gained immunity from death for 10 days. System mission: clear out human strongholds and reward cultivation techniques. When the cold system issues a mission to destroy the world, when evil ancient books record alternative methods of immortality. He Fan wants to use this gray mist energy to condense Qi, turn it into a pill, and embark on an unprecedented path to the end of the world!