Cthulhu Mythos

The Cthulhu Mythos (クトゥルフ神話) is the name given to the fictional universe, featured in the world of Toaru Majutsu no Index, in which the stories of (referred to as the "genius author" in the narrative) and other authors after his  are based. It has been used as a base for spells created by certain magicians who desired to see the world described in those stories.

Principles
Since the Cthulhu Mythos is a fictional universe, spells involving it are defined as creating something from nothing.

Many stories in the Cthulhu Mythos describe the rampages of evil gods (such as Cthulhu, Yog-Sothoth and Nyarlathotep) from the perspective of humans on the sidelines - in a sense, they are a catalog of those evil gods. These evil gods are beings no human can handle, however they all have a point in common - they all gain their role and terror from the story they represent. Ceremonies and spells using these evil gods cannot ignore this story aspect and no matter how frightening, they cannot do anything once the story has come to an end, until the next story begins.

While some of the spells based on the Cthulhu Mythos are quite potent, due to the fact that the evil gods are beings which no human can handle, humans using a spell involving them will not be able to control the effects once it is unleashed and will be at risk if they are caught in the spell or it is directed back at them.

One prominent symbol of the Cthulhu Mythos, used in certain spells derived from it, is human flesh and blood.

Background
When Lovecraft was writing the Cthulhu Mythos, one of the subjects he apparently used as reference material was the Forgotten God, one of the Magic Gods of the true Gremlin. In the process and aftermath however, fiction and nonfiction mixed together so badly that the Forgotten God's original form was completely forgotten.

At an unknown point after the first stories of the Cthulhu Mythos were published, magicians calculated how to recreate the despair-inducing events in them and created spells with that purpose. They compiled such spells in the Necronomicon, which was then released into the world.

A number of incidents relating the Cthulhu Mythos are reported to have occurred. These include a man attempting to use a jewel in a box to call in someone not of this world, a marriage scam artist sending someone a yellow medallion to have them meet an evil god and steal their inheritance and an old man trying to create an existence guarding a gate that would allow him to travel to another world.

One notable event occurred in the Pacific, three years prior to the story's first year on August 2nd, orchestrated by the magic cabal Dusk Waiting to Awaken. A ceremony attempting to summon R'lyeh caused 103 workers aboard the resource extraction ship Condor to go insane. However the ceremony, which would have wiped out the residents of every island within 1000 km had it succeeded, ultimately failed. The incident was initially thought to be sabotage aimed at causing diplomatic tension between England and America as well as the international competition over underwater resources. However after the discovery of magical symbols on the ship, England covered up the incident as being caused by rough weather and no land in sight pushing the sailors to their psychological limits, and installed a facility in the area, supposedly to calm the minds of those at sea but actually to keep an eye on where the ceremony took place.

Necessarius Special Admission Test SS
Spells derived from the Cthulhu Mythos were the focus of the events that occurred during the Amakusa's admission test for Necessarius, when magicians from Dusk Waiting to Awaken impersonated them in order to steal the Necronomicon.

Using the stolen Necronomicon and a barge in the Strait of Dover, the cabal's leader Arlands Darkstreet began a ritual to summon R'lyeh. Though this was thwarted by the Amakusa, he succeeded in obtaining data he needed, which was transmitted to another group stationed at Stonehenge, who attempted to create the new spell Blank Paper. The Stonehenge group, led by Vase, then utilized Cthulhu Mythos-based magic while trying to fight off the Amakusa, before they were all suddenly dispatched by a surprise attack by Freadia Strikers.

Other references to H. P. Lovecraft

 * Necronomicon
 * Necronomicon
 * Necronomicon

References to other authors

 * by Robert W. Chambers
 * by and
 * "The Moon-Lens" by
 * by Clark Ashton Smith
 * by Clark Ashton Smith
 * by Clark Ashton Smith