Cthulhu Invades, My Fellow Taoists and I Fight Against the Enemy Together

I, Yan Jiu, a high school student who is about to take the college entrance examination, and a rich second generation, but because of an accident, I traveled to the world of cultivation. I have the same name as Yan Jiu, but I found that the world of cultivation here is very different from the world of cultivation I know... I awakened the mutated thunder spirit root, entered the Tianshu Sect, the number one sect in the world, and worshiped Patriarch Lei Xiao as my teacher. At a young age, I had already reached a point beyond the reach of the same realm. So I bid farewell to my master and went out with Lin Moran to explore. On the way, I met three like-minded fellow Taoists, and together we strangled the Cthulhu clan. Just when the three realms of humans, demons and demons united to defeat the Cthulhu clan, I traveled back to modern times. Countless years in the world of cultivation were just a dream in modern times, but my sword and realm were still there. I took advantage of the only one day left to use my photographic memory to memorize important knowledge. When the exam bell rang, the ground suddenly shook, and many people in strange clothes appeared out of thin air from all over the place. A large crack opened in the clear and cloudless sky, from which black-red mist poured out, and a tentacle hundreds of meters long stretched out from it. When people were frightened and fled in panic, only those people in strange clothes and I faced it calmly. I smiled, broke the window and jumped out, turning my pen into a sword...