How were the levels of immortals in novels divided?

As disaster was about to strike, a group of survivors transmigrated into a desolated world and were challenged to a game of survival. From terrifying acid rains, to endless natural disasters, the heavens burn while the earth scorches, radiation is rampant, and nobody is spared from the dangers of this hellscape. The only way one survives is by building a shelter and slowly upgrading it in hopes of surviving another day. Luckily, Su Mo awoke a Doomsday Survival System that allowed him to infinitely level up and upgrade his shelter! The main shelter wooden door can be upgraded into a metal door, which in turn upgrades into a composite gate; the wooden spears can be upgraded into bronze spears, which eventually upgrade all the way into electromagnetic spears... While everyone struggled to survive, Su Mo was fully loaded, and well equipped to dominate the post-apocalyptic world. "While some of us are lighting oil lamps, he's been using refrigerators!" "The walls in his shelter alone are tens of meters thick, it's the safest place on this planet." "Before I die, I wish to spend one day in his shelter..."

Untolerated by heaven, a boy was restricted by the most powerful spell. He accidentally acquired a painting inhabited by nine souls that claimed to be immortal. Then, the legend of a strong young man who violated heavenly principles against the course of nature began.

Finding an ancient treasure was not as fortunate as one might expect. As soon as Bai Rouyun had left the grave, countless sects and hidden families set out to kill her for the sake of obtaining her treasure for themselves. After months of killing, and leaving a trail of numerous corpses, Bai Rouyun finally could not continue. Unwilling to succumb, she gave up, throwing herself off the mountain top, taking the treasure with her to the eternal grave in the clouds. However, the treasure she had picked up was anything but ordinary. Soon she woke up in the body of a mute, deaf, and mentally challenged woman who... had just gotten married? Trying to get used to her new life, swearing to gain vengeance while juggling her newlywed husband, was a task that genuinely required all her wits.

"You don't belong here." "Perhaps to you I don't but I'm not going anywhere," I replied unwilling to let him scare me. A deep chuckle left his throat as he stepped closer, "I can do terrible things to you-" Damian, and his brothers, were a mysterious sort and every moment with them, I was begging for pleasure. ~~~ When Ivy Thorne got accepted to one of the best Universities for Agriculture, she refused to miss the opportunity. The only problem she never expected was the four men who lived in her father's home would gradually turn her world upside down. Dangerous things don't live just in the wild. Often, they lurked closer to home and if she wasn't careful, she would find herself the center of their hunger. Their own little red riding hood. This story is rated 18+ for explicit language and sexual content. And Then There Were Four is created by Lillith Carrie, an eGlobal Creative Publishing signed author.

In the Upper Heavens, the Space-Time Immortal had gone into hiding after acquiring a weapon. All the experts of the Upper Heavens felt that the Space-Time Immortal was preparing a big move. The only way to find the Space-Time Immortal was through his Temporal Demon Spirit Book that was present in the lower realms. However, it was impossible for them to pass through the restrictions of the realms and travel to the lower realm to acquire the Temporal Demon Spirit Book. The Celestial Immortal of the Upper Realm used his special artifacts to gaze into the Lower Realm to find the Temporal Demon Spirit Book. He found the new master of the Temporal Demon Spirit Book, Nie Li. After gazing into Nie Li's destiny, he realized that Nie Li was a future helper groomed by the Space-Time Immortal's Spirit within the Temporal Demon Spirit Book. Thus, the Celestial Immortal chose an individual from the modern earth who could defeat Nie Li and acquire the Temporal Demon Spirit Book for him. Alan Semmens was chosen for this great task. But he had his own thoughts regarding this mission. Check out what he plans to do after transmigrating into the 'Tales of Demons and Gods' world! ~~ A/N: Heya guys. I always wanted to write a TDG fanfic so I am just fulfilling that desire. Anyway, here's the basic info for you all. Mc will be transmigrating into Shen Yue's body. He will possess a system, but the best techniques in this system will be the same as that of the Temporal Demon Spirit Book. Meaning that Nie Li will possess those techniques as well. But he will have other advantages when compared to Nie Li's hacks. I hope you all love the story. Discord: https://discord.gg/ZgBRuAu5pT P.a.treon: http://bit.do/evildragon04

This is the story of an Illegal Pharmaceutical Scientist Otaku who died, and was reincarnated into DXD as pure blood devil. "If people got themselves reincarnated into another world, usually they would try their best to fix the plot into better one right? Me? Sorry I think I'll just taint or rape all the beautiful women that are my type. (Not for Kids high amounts of rape :3!)