Greek Mythology

Greek Mythology (ギリシャ神話) is the mythology of the ancient Greeks. A large part of Roman mythology is derived from Greek mythology and it forms the foundation of what is known as Classical Mythology.

Principles
As a mythology with a pantheon of gods, it operates similarly with Norse Mythology. As gods of polytheistic religion, they have emotions similar to those of humans such as love, justice, fear, and jealousy, and having doubts and failures like any one else. These gods aren't perfect, and such as when combined in a single group, complemented each other's weaknesses, creating a single flexible system, a sturdy defense system that could not be overcome by any foe.

Like a number of other mythologies, the primary deities of Greek mythology are a younger generation of gods who fought against an older, more chaotic generation of gods, in this case the Titans, conquering them and taking their place.

Background
Though Greek mythology-based Magic has yet to appear in the main story of Toaru Majutsu no Index, it has been mentioned as a potential magical format, and as one of the many religions and mythologies which have caused Phases to be created over the world.

Greek mythology was one of several fields which influenced the development of Hermeticism, which would become part of the foundation of the Golden Dawn.

Uses of Greek Mythology in the story

 * Ambrosia: The fruit of the gods which bestows immortality.
 * Ambrosia appears as the cause of Ladylee Tangleroad's immortality.
 * Cocytus: Meaning 'river of wailing', one of the rivers in the Greek underworld.
 * Cocytus Replica is one of several Grand Magic spells mentioned by Tsuchimikado Motoharu.
 * Endymion: A mortal loved by the moon goddess Selene and placed in eternal sleep.
 * Endymion was the name given to a space elevator which was the focus of the film Toaru Majutsu no Index: Miracle of Endymion.
 * Hermeticism: A magic system that is based primarily upon the writings attributed to  ("Thrice Great").
 * Hermeticism: also called Hermetism, comprises beliefs and practices whose purpose is the influencing of the world through the three parts of the wisdom are: Alchemy, Astrology, and Theurgy.
 * Hypnos: The personification and God of Sleep.
 * Hypnos is a movie that is an experimental visual experience according to Kinuhata Saiai, where the audience is strapped into their seats for twenty-four hours straight.
 * Medusa: A monster said to have the face of a female human, but with living poisonous snakes in place of hair and a gaze that can turn anyone who makes direct eye contact with her to stone.
 * Mitsuari Ayu, while equipping the FIVE_Over (Out_Sider) - Modelcase_"MENTAL_OUT" and wearing the "Fat Misaki" Designers' Gel suit, references Medusa and compares her appearance to her in attempt to disturb Shokuhou Misaki. She also references the legend on how Medusa was turned into a monster and how the story of her hideous appearance terrifying people as if they were turned into stone evolved into her literally having the power to turn people into stone.
 * Mount Olympus: The tallest mountain in Greece, on top of which the Gods are said to dwell.
 * Mount Olympus is referred to by Othinus as one of the various Phases applied to the world.
 * The seven stars of Olympus are referred to during Index's analysis of the grimoire content in the Windowless Building.
 * Persephone: The daughter of the agricultural goddess Demeter and Queen of the Underworld, whose abduction by Hades, and the subsequent arrangement to have her spend half of the year with him and half of it with her mother, led to the changing seasons.
 * A member of the true Gremlin bears the name of Persephone's Roman counterpart, Proserpina. Proserpina also makes use of a planetary-scale artificial ice age spell based on how her mother made it so that spring wouldn't come to the world until she found her daughter.
 * Aspects of Persephone's myth, namely the pomegranate seeds which bound her to the underworld when consumed, are used by Kihara Yuiitsu, through the attenuated St. Germain virus, in a spell meant to appear like Proserpina's magic.
 * Prometheus: One of the Titans, who defied Zeus in stealing fire and granting it to humanity.
 * Mina Mathers was compared to Prometheus in the way she crafted the Golden Dawn's cards and ceremonial tools and inspired magicians with her art, like him giving fire to humanity.
 * Sibyl: A priestess who could look into the future, though the term can also designate any female prophet.
 * According to Stiyl Magnus, Ladylee Tangleroad was once a Greek sibyl specializing in astrology.
 * Sword of Damocles: A sword which was hung over as he was allowed to sit on the throne by his king, to illustrate the perils that came with kingship.
 * The legend was apparently recreated as a test of courage for royalty and nobility to prove their worth, and the sword was later used against Aleister Crowley following his defeat by Kamijou Touma.
 * Titans: An earlier race of gods who were overthrown by the Olympians.
 * Marian Slingeneyer uses Dáinsleif to summon one of them by cutting away the Olympus Phase.
 * Urania: Daughter of Zeus and Mnemosyne, and muse of astronomy.
 * The goddess's name is included in the name of the Golden Dawn's Isis-Urania Temple.