Fantastic Tribulation

The Fantastic Tribulation is a setting where the world has been through an event where supernatural forces (such as monsters from fantasy) bring chaos throughout Earth. This massive phenomenon renders society incapable of countering the event through conventional means. This leads to either an Urban Fantasy or an After the End scenario turning into a Cozy Catastrophe. Both, however, involve people gaining magic or some other form of mystical powers that are crucial to surviving in this new world.

An interesting trend has been seen in media like Korean web novels and webtoons. A common occurrence is having dungeons filled with monsters but they can be conquered by unique individuals. These people with powers counter these changes, thus giving way to stability. They are often connected to a system that functions like RPGs that can grant them these abilities and may be related to the society-changing catalyst. These people bring temporary peace by defeating them, including treasures, equipment, and mystical resources. Magic always plays a part as the cause or another tool for people to use.

If the setting becomes an Urban Fantasy, the society that comes into fruition has a new status quo or even benefits from the change. However, other problems may occur, not only from these forces but also from the people seen as protectors.

Contrast The Magic Comes Back.

Anime and Manga

 * The World Is Overflowing with Monster, I’m Taking a Liking to This Life is set in a world devastated by monsters. There’s no access to electricity and other modern conveniences. People can use an RPG-like system that gives them skills, jobs, and increased stats... but animals and monsters also utilize this system.
 * JK Musou - Owaru Sekai no Sukuikata has monsters rampage globally, leading to societal decline. People called 'Players' can use skills and magic like in a role-playing game.
 * In Bouken-ka ni Narou!: Skill Board de Dungeon Kouryaku, an event called 'The Stampede' has caused dungeons to appear worldwide, with monsters ravaging the world. Civilization has bounced back as the government allows people to become Adventurers to venture into dungeons, defeating monsters and levelling up while gaining magical items and equipment.
 * In Ookami Nante Kowakunai!!'s Tonda Birthday Present, the high-school student Tetsu has a grandfather who is an inventor, but the machines usually blow up in his face. So for his grandson's birthday, he makes a virtual reality machine to play 'Dragon Chest' for his birthday, but it malfunctions. This event causes the game to become real where people turn into NPCs and monsters while Tetsu becomes the hero and save the princess (his crush) from the Dragon King.

Literature

 * System Apocalypse causes various creatures such as monsters and aliens, to appear on Earth. This causes modern technology to stop functioning. However, the System helps by acting like an RPG for people. If preconditions are met, it also provides other services such as constructing buildings, providing food, water, electricity, etc.
 * In The S-Classes that I Raised, dungeons have appeared worldwide where monsters spill out, leading to catastrophe for the population. The Awakened, people who simultaneously emerge to fight these monsters with their supernatural abilities while also leveling up to gain strength and skills.
 * The New World series by James Khan, consisting of World Enough, and Time (1980), Time's Dark Laughter (1982), and Timefall (1987), is set in a world where magic came back and technology abruptly stopped working, and the creatures of myth reappeared.
 * The Earth is Online: Myriads of black towers begin to float above cities, ominously but harmlessly. Then one day, a voice announces, “Ding dong! November 15th, 2017. The Earth is online.” Next thing people know, the towers are issuing deadly survival games, and humans are suddenly gaining unusual powers.

Oral Tradition, Folklore, Myths and Legends

 * The Great Tribulation, as described in chapters 7-10 of the Book of Revelation, is the Trope Codifier. This makes the trope Older Than Feudalism.
 * Due to often colorful and esoteric language of the text in question, it's enough to say those who believe in Christ and those who support his enemy, called the Beast both acquire some limited supernatural abilities during this period, the formerly mostly immunity from certain kinds of supernatural harm that the other side has no defense against. The opposing side gains mostly offensive powers and the ability to deceive the undecided into being swayed to their side.

Tabletop Games

 * In the backstory of Shadowrun, magic has come back. Yeah, a significant fraction of humanity turned into elves, orcs, trolls, and a couple dozen of other races. Sure, practically every mythological beastie from dragons on down popped out of the woodwork.  Yeah, there were political upheavals. Did that end the world?  Hell, no! That would be bad for business! Besides, Cyberpunk tech made dealing with the Sixth World so much easier.
 * The interdimensional invasion by the "High Lords" establishes the setting of TORG explicitly revolves around each participating cosm getting a foothold on Earth. This changing the laws of nature in the area where it has control to make Earth reflect its native reality. The various realities vying for control of the Earth included a traditional High Fantasy setting, a Cosmic Horror world, two different Cyberpunk worlds, and several Pulp and Weird Fantasy cosms.  Players were "Storm Knights'' opposing the invasion of Earth.

Web Comics

 * microHUNTER has everyone in the world shrinks down to 3cm, where insects, birds, rats, and even doors are dangerous. However, people are granted abilities that have their strength determined by a level while also checking their status through game-like windows.
 * Solo Login has Players that can access Castles and Dungeons filled with monsters to level up while gathering money and equipment. Sky Players can access Sky Castles while Underground Players can enter Underground Dungeons. Monsters can travel outside of Underground Dungeons and attack cities.
 * Ten years ago, in I am the Sorcerer King, Rifts appeared worldwide, where countless monsters pass through and cause chaos. People called the Awakened are connected to the Ahkasha System under the Director of Ahkash, which allows them to access notification windows, acquire a job, level up, grind stats, and gain skills.
 * In Omniscient Reader’s Viewpoint, the world goes through an apocalyptic event where people must participate in deadly Scenarios for cosmic live streamers. Every person is granted unique skills while also gaining coins that can be used to upgrade these skills.
 * Raid (SF) has a setting where a supercomputer has taken over the world by introducing nanomachines worldwide. Everyone has a watch-like device called a Nanocircle, which augments their abilities and grants equipment, including getting rewards from various quests given by the computer.
 * In Solo Leveling, portals worldwide called Gates connected to another dimension dubbed a Dungeon teeming with monsters termed Magic Beasts. Simultaneously, people known as Hunters appeared with magical powers that can fight these beasts while keeping the public safe from them.
 * Kill the Hero has Dungeons appearing around the world where monsters poured from portals. At the same time, divine beings called Nimbus appeared that grant a small number of people called Players with a power called the Authority. A Player has access to skills depending on the Nimbus while being able to level up and check their status through system displays.
 * In Raid, 50 years ago, Demon World Gates appeared worldwide where Demons crossed these portals to cause havoc. Concurrently, God then granted humans called Masters (whose powers co-relate to MMORPGs roles like Tanker, Melee DPS, and Healer) who fight against these monsters.
 * Tomb Raider Kinghas Tombs appearing all over Earth in 2025, where massive earthquakes announce their appearance. Deep inside these dangerous buildings are powerful items called Relics based on myths and legends from human history. People who venture into these Tombs are known as Tomb Raiders (no relation to Lara Croft). Society set up laws to restrict people's use of Relics while others monopolize these artifacts.
 * Metro Hunter: Seoul's metro lines have been turned into dungeons where monsters and other beings from another world appear. The city was in chaos until people called Metro Hunters explored these dungeons while hunting monsters to keep the peace.
 * In The Advanced Player of the Tutorial Tower, giant towers called Tutorial Towers appear worldwide where random people are teleported in. The people trained in these towers until they became Hunters who gained magic and powers to fight monsters from dungeons that have appeared alongside the Tutorial Towers. Hunters have become so famous and influential that their associations and guilds have gained more influence than governments.
 * The World After the Fall has mysterious towers manifest worldwide that spreads monsters from them. People have the choice of becoming Tower Walkers, gaining powers to fight these monsters. They also can use a regression stone to return to the past for a second chance but goes to an alternate timeline.
 * I'm the Max-Level Newbie: A game known as Tower of Trails was an online game known for its difficulty, which caused its popularity to decline. On the day it was shut down, the tower appeared in reality, and a message that humanity would die unless players cleared each floor in 90 days.
 * Seoul Station's Earth has people summoned to different worlds where they gain jobs with magic and skills until they are sent home. The problem is that dungeons and monsters related to these worlds have been summoned on Earth. These people are employed to hunt these monsters for peace and also commission.
 * My S-Class Hunters: Gates are global portals where monsters pass through from dimensions known as Dungeons. This led to the event known as the Dungeon Shock, where monsters populated cities where thousands of people were injured or killed. At the same time, people known as Awakened gained certain powers that could fight the monsters and clear dungeons. Later on, they are called Hunters and became the most important form of employment globally.

Western Animation

 * In the episode "The Console" from The Amazing World of Gumball, a Game Child temporarily turns the entire town into a JRPG. Gumball, Darwin, and Anais form a party to turn the city back to normal.
 * In Thundarr the Barbarian, the Earth’s climate and geography have been drastically changed due to a meteor passing its orbit. This led to magic, savagery, and Weird Science appearing on Earth, resulting in chaos worldwide.