Double Portal in the Apocalypse: Become Invincible by Selling Flying Swords

In 2030, natural disasters struck and global changes occurred. Lu Yuan traveled through time, awakened the "double portal" power, and connected to the world of immortality! Humanity fought to death for a first-order crystal core. In the end of the world, the first-order crystal core is a life-saving straw; in the world of immortality, this thing is the best spiritual stone! Lu Yuan resold like crazy and exchanged a cart of crystal cores for "Tai Shang Sword Jue" and "Nine Transformations Golden Pill"! While the doomsday superpowers were still painstakingly studying the first-level fireball technique, Lu Yuan was already flying with his sword, casually throwing out "Ten Thousand Swords Returning to the Clan"! He forcibly unified the apocalyptic power system and the realm of cultivating immortals into "levels one to nine": those with first-level powers are equivalent to the Qi refining stage; those with ninth-level powers can barely touch the threshold of the Mahayana stage. When the alien gods came, Lu Yuan used the "Xianxian Sword Formation" exchanged from the world of cultivating immortals: "Everyone, times have changed, cultivating immortals is now popular!"