I Mistook High-Martial Arts for Honghuang, and the System Forces Me to Cultivate in Bizarre Ways

At eighteen, Jiang Fan had achieved nothing. He thought his life was already all mapped out, but unexpectedly transmigrated to a future world with advanced martial civilization and acquired the strongest cultivation System. [Ding! The Host has arrived in the Primordial World. Main quest triggered: Join an immortal sect.] “First of all, this is a city... What? Going to school counts too?” [The Host lacks a cultivation technique. Side quest triggered: Obtain at least one cultivation technique.] “Heh heh heh, I know this one. You mean a textbook, right?” [A suitable Dao companion has been detected. Host, please make a choice.] “Wait, isn't this a reptile zoo? Hey, you lizard, why are you staring at me?!” A word of advice: I'm in a high-martial world, but the System mistook it for the Primordial World. Good thing the System really does hand out the goods! So loyal! From [Dragon-Elephant Body Tempering Art] to [Sixteen-Foot Golden Body], from [Five Viscera Essence Tempering Art] to [Nine Revolutions Arcane Art], from [Hajimi] to [Xiaotian Dog], from [Ice Cream] to [Red Armillary Sash]! Years later, an alien evil god that has devoured several civilizations awakens from the abyss, while star-faring races descend from the heavens, intent on keeping humanity as livestock... Atop the sea of clouds, Jiang Fan produces the Immortal-Slaying Sword, the Human Emperor Banner, the Sea-Calming Divine Pearl, the Book of Life and Death, the Taiji Diagram, and the Heaven-Opening Axe. One man alone is an entire sky full of gods and Buddhas.