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Gagiel: The angel associated with fish and water in the Judeo-Christian tradition. Arariel and Azareel are the other angels over fish.
Gaki:  (Japanese Folklore) Buddhist name for restless or hungry spirits. (See also: "Yurei")
GANZFELD: Term referring to a special type of environment (or the technique for producing it) consisting of homogenous, unpatterned sensory stimulation: audiovisual ganzfeld may be accomplished by placing translucent hemispheres (for example, halved ping-pong balls) over each eye of the subject, with diffused light (frequently red in hue) projected onto them from an external source, together with the playing of unstructured sounds (such as “white” or “pink” noise) into the ears, and generally with the person in a state of bodily comfort; the consequent deprivation of patterned sensory input is said to be conducive to introspection of inwardly-generated impressions, some of which may be extra-sensory in origin. [From the German for “entire field”]
The use of the word "manual" refers to the fact that the target selection is carried out by manual access to computer or random number tables as well as the fact that all the important events in the experiment are recorded by hand. Consequently, the technique has limited safeguards against fraud or data selection compared with the autoganzfeld.
An implementation of the ganzfeld technique in which many of the key procedural details, such as selection and presentation of the target and the recording of the evaluation of the target-response similarity given by the percipient are fully automated and computerized, the goal being to reduce as far as possible errors and sensory communication on the part of the human participants

Ganzfeld Experiment: Initiated by Charles Honorton’s Psychophysical Research Laboratories in Princeton, New York. Subjects are tested lying down with eye coverings and white noise hissing through headphones to put them in a sort of altered state of consciousness that is believed to leave one open to telepathic suggestion.

Gargoyle: n : A grotesque carving which is usually in the form of a human or animal mouth, head or body, projecting from the gutter of a building. This type of carving is often found in Gothic architecture and its practical function is usually to act as a spout or drain to channel away rainwater. The grotesque nature of the carving is also thought to serve as a frightening deterrent to ward off bad luck or evil spirits.
Gashadokuro: In Japanese folklore, the ghosts of people who have starved to death. The "gashadoduro", or "starving  Skeleton" appears as a giant skeleton, up to 15 feet times taller than a person, made up of the bones of the starved dead. It roams about after midnight and announces itself with a ringing noise that sounds in the ears. If you do not flee , it will bite your head off with it's giant teeth.

Gauss Meter: An instrument which measures electromagnetic fields. Also called EMF detectors or magnetometers.

Geller Effect: The ability to bend metal by paranormal means; named after the Israeli stage performer Uri Geller, who was the first person to claim publicly the metal-bending ability; the term has been largely superseded by “PK-MB,” or, more simply, “metal-bending.” See also Mini-Geller; Psychokinesis.

Gemstone n : a highly polished semi-precious stone that is often linked to the birth sign of an individual. For each sign of the zodiac there is a corresponding gemstone which if worn in some way, is said to bring good luck. (See also “Amulet” and “Crystals”).

General Extra-Sensory Perception (GESP): A non-committal technical term used to refer to instances of extrasensory perception in which the information paranormally acquired may have been derived either from another person’s mind (that is, as telepathy), or from a physical event or state of affairs (that is, as clairvoyance), or even from both sources; experimental parapsychologists rarely use the term “telepathy” because of the difficulty, in tests of so-called telepathy, of excluding the possible operation of clairvoyance.

General Extra-Sensor Perception  (GESP): The alleged ability to use telepathy and clairvoyance in combination. A term that refers to a form of ESP that when it occurs, it is particularly unclear as to whether or not the results were due to clairvoyance, precognition, retrocognition or telepathy.

Geomancy: An ancient form of divination which involves the scattering of soil, earth or other materials upon the ground or, markings in earth or sand which make up a configuration that can be read by a seer.

Geophysics: A branch of earth science dealing with the physical processes and phenomena occurring especially in the earth and in its vicinity.
Geomancy: Drawing a picture that matches up with a picture previously sealed in an envelope of which the subject had not seen.

GHOST: As popularly used, this term denotes only the apparition of a deceased person, and is not sufficiently precise for use in psychical research. [Ashby, 1972]. In general, it refers to the soul, life force and/or consciousness of a deceased person.

Ghosts, Calling: Ghosts that call out the name of the living in order to get their attention.
Ghost Busting: The act of exorcising; the driving out of evil spirits from persons or places by conjuration; also, the form of conjuration used.'

Ghost Hunting: Literally hunting or looking for ghosts. In general, looking in a location for possible ghosts without a previous report of activity. Various research groups have been set up to investigate the phenomenon of ghosts; some do it as a hobby and some take the subject much more seriously. Ghosts are known to frequent certain places more often than others, graveyards seem to be an obvious common starting point.

Ghost Lights: Lights which sometimes appear in haunted houses or in some cases, woods. Not necessarily evil, these lights are often photographed by psychic researchers. In many cases, the Ghost Light will disappear when approached. Most commonly reported to be round or spherical, this is not the rule.

Ghost Ship: The appearance of a ship that has been know to have wrecked or disappeared years or centuries before to fore warn of a pending disaster. (In sailing, the term “Ghost Ship“ merely means that there are no crew visible aboard a vessel at sea).
Ghost Sickness: The belief that ghosts of the dead can cause illness and death.
In the animistic system of beliefs characteristic of tribal societies around the world, the spirit of a deceased person is thought to remain close to the corpse for a few days before beginning  it's journey to the land of the dead, and during this in-between time, or liminal, period it is particularly dangerous to the living. The ghost is portrayed as lonely in its new existence and so inclined to seek company from among the living. Children in particular are susceptible of ghost sickness, because their souls are less strongly attached to their bodies. Among the Kwakiutl Indians of British Columbia, children are sometimes disguised or referred to as adults, in order to confuse the ghosts into thinking that they are older than they are.
Fear of ghost sickness accounts for the widespread fear of the dead as expressed in such practices such as carrying the corpse out of the house through a hole in the wall rather than a door or window which is intended to make it difficult for the ghost to find it's way back into the home. Although ghosts are most feared by  immediately after death, in many societies any sighting of an apparition or sounds suggestive of a poltergeist are harbingers of disease or death.
Ghost Smells: Spirits that have a desire to communicate with friends and loved ones may chose to do so in a variety of ways. Everyone has heard stories of a misty form coming to someone in a time of grief or of ghostly voices speaking words of comfort or warning, but have you ever heard of a spiritual message sent by smell? Science has proven that scent and memory are very tightly connected. Those close to you may wish to let you know they are present without sending you into a panic with the sight of a full-body apparition or making you question your sanity looking for the source of an unseen voice. Using a scent that you are sure to notice or that can instantly trigger a past event is a gentle way for spirits to communicate without causing alarm. One of the mysteries surrounding olfactory paranormal phenomena is that it is often only perceived by one or two people in a room while it goes unnoticed to others. Some researchers have theorized that the odors are not present in the air at all, rather that spirits are directly manipulating the olfactory receptors in the brain to send their message. Obviously, this theory will take further advancement of science to test. Until then, trust your nose. (See also: "Floral Scents", "Every Day Life Scents", "Negative Scents").

Ghost Story: Any piece of fiction, or drama, or an account of an experience, that includes a ghost, or simply takes as a premise the possibility of ghosts or characters' belief in them. Colloquially, the term can refer to any kind of scary story. In a narrower sense, the ghost story has been developed as a short story format, within genre fiction. It is a form of supernatural fiction, and is often a horror story. While ghost stories are often explicitly meant to be scary, they have been written to serve all sorts of purposes, from comedy to morality tales. Ghosts often appear in the narrative as sentinels or prophets of things to come. Whatever their uses, the ghost story is in some format present in all cultures around the world, and may be passed down orally or in written form.
-Traditional ghost story: has its roots in folklore, but its prose style is characteristic of the romanticized writers of the gothic tradition that preceded it.
-Psychological ghost story: the emphasis is on the perceiving consciousness of the victim, instead of the actions of the ghost. These tales frequently call into question the reliability and mental stability of the protagonist, and may investigate social issues.
Antiquarian ghost story was born from more folkloric origins and in this sense is more closely tied to the traditional ghost story. Many of its practitioners were scholars or clergymen, and they discarded the romanticized prose of the traditional school, favoring realism and gentle escalation of the supernatural within the narrative, typically after some ancient medieval relic has been disturbed in some way.

Ghostly Transport : is a phenomenon that challenges the commonly held view that ghosts are spirits of the dead. There are a wide variety of reports about phantom vehicles or ghostly forms of transport some forms reported more often than others.
Out of all of the reports of ghostly transport, ghostly cars are possibly one of the rarest forms of phantom vehicle. One of the theories behind this, is that the car is a relatively recent invention which has left little time for the phenomenon to become established. It would seem that many reports of phantom cars appear, sadly, to be linked to tragic road accidents. However, the predecessors to cars, namely horses and carriages, do tend to be much more frequently reported, probably due to them being around much longer.
Apparently, phantom trains account for one of the more common forms of ghostly vehicle. They are said to appear, usually at the site of a rail disaster. One example of this was the Tay Rail Bridge disaster in Scotland in 1879. Here a bridge collapsed in a bad storm, leaving the oncoming train to plunge into a river below. Unfortunately, there were no survivors, and since the bridge was repaired, there have several reports of a phantom train disappearing near the middle of the reparations. As with all forms of phantom transport there does not always have to have been a tragic accident beforehand, for example Abraham Lincoln's funeral train. This phantom funeral train is said to pass along the original route taken by Lincoln's funeral train. Witnesses have reported it passing along, complete with a skeletal band on one of the wagons, playing an unidentified tune.
There are even reports of ghostly planes that appear to be apparitions of military planes from the world war. Sightings of such phenomenon appear to be more common over Britain, France and Germany. This could be linked to the number of craft lost during the last world war. It would appear that there isn't anything specific that triggers the materialization of these ghostly planes, although it is suggested that violent storms may invoke a few.
Ships are a much older from of transport than cars and planes and as a result reports of ghostly ships abound. One example is an 18th century ship called 'The Flying Dutchman'. In this tale the captain of the ship, Henrik van der Decken is alleged to have sworn in a fit of rage; that he would round the Cape of Good Hope even if it meant sailing for all eternity and straight into the wind. He even suggested that God himself could not stop him. Legend now has it that the ghostly ship appears during stormy weather off the Cape of Good Hope, at Africa's southern tip during stormy weather. On board is van Decken, who because of his evil nature and taunting of God is condemned to sail forever into the wind. Mariners fear the sighting of 'The flying Dutchman' because it is said to be a bad omen, and any sailor that spots it, will be thus doomed to join van Decken and his ghostly crew in their special form of damnation. (See Also: “Ghost Ships).
Ghoul: A demon in Islamic lore who feeds on the flesh of human beings, especially travelers, children or corpses stolen out of graves. Ghouls are nocturnal creature who inhabit graveyards, ruins and other lonely places. Sometimes they described as dead humans who sleep for long periods in secret graves, then awake , rise and feast on both the living and the dead. Ghouls also personify the unknown terrors held by the night terror demons. In classical mythology, lamiae are monsters who feed on the flesh and blood of the young. Lilith, traditionally the first wife of Adam, is the wife of the Devil whose children are the Djinn demons.
In Islamic lore, there are several varieties of ghouls, but the most feared is the female type that has the ability to appear as a normal human woman. Such a creature marries an unsuspecting man, who becomes her prey. From Arabic  "ghul" (masculine) and ghula, (feminine).
Gidim: (Sumerian Mythology) (etemmu in Akkadian)  The Sumerian equivalent of ghosts; they were the spirits of dead people living in the Underworld. The deceased human consisted of two parts: the adda and the gidim. In Sumer, the body (adda) was often buried under the floor of the family home at which time the gidim separated and went down into the Underworld. A gidim could be powerful, depending on personal valor and accomplishments of the deceased while alive and also on the number of sons he had. A gidim was weak if the deceased had few or no sons or had achieved little during his lifetime. Powerful gidim could return to the land of the living while weak gidim might not have sufficient strength to make the journey back up to the Great Above. The worst that could happen was for a dead person not to be buried. If that happened, the gidim, even a weak gidim, was liable to persecute whoever was responsible. Once the deceased had been properly buried, the gidim descended to the Netherworld where it stayed unless not properly fed or remembered by the living, in which case, if it was powerful enough, it returned to the Great Above to haunt those who had been negligent.
Gilgul/Gilgul neshamot/Gilgulei Ha Neshamot: (Hebrew: גלגול הנשמות, Plural: גלגולים Gilgulim) refers to the concept of reincarnation, emanating from the Kabbalistic framework within Judaism. In Hebrew, the word gilgul means "cycle" and neshamot is the plural for "souls." Souls are seen to "cycle" through "lives" or "incarnations", being attached to different human bodies over time. Which body they associate with depends on their particular task in the physical world, spiritual levels of the bodies of predecessors and so on. The concept relates to the wider processes of history in Kabbalah, involving Cosmic Tikkun (Messianic rectification), and the historical dynamic of ascending Lights and descending Vessels from generation to generation. The esoteric explanations of gilgul were articulated in Jewish mysticism by Isaac Luria in the 16th century, as part of the metaphysical purpose of Creation.
Glashan: (Also: glaistyn, glastyn) Manx counterpart of the Irish each uisce, Scottish kelpie, and Welsh ceffyl dwfr, the mischievous water-horse. Although the glashtin might take human form, he could not hide his horse's ears. Sometimes confused with the heavier, shambling fenodyree, but more human in appearance.
Globule: A tiny sphere of electromagnetic energy. Spirits often appear on film as globules. Also referred to inprecisely as “Spirit Orbs“, “orbs” or “O.L.O.’s“. These are not always perfect circles.

Glossolalia: “Speaking in tongues” during ecstatic trances.

Glottologues: Mediums who speak in tongues.

Gnome: A name given to fairies or 'little people', supposedly lost souls or pre-Christian people, or fallen angels doomed to walk the earth. It has been suggested that they are elemental nature spirits that inhabit a different dimension to our own. Some believe that they are visible thought forms that are mentally projected like the ideas proposed by Ted Serios, America's leading thoughtographer. Gnomes are even thought by some to be the last remnants of an ancient pigmy race of ancient Britons.
Goatman, The: A hominid cryptid associated with the state of Maryland in the USA. It is described as a hybrid creature; part man and part goat. Some claim it is a relative of Bigfoot. Its appearance is similar to the satyrs or the god Pan of Greek mythology, or to the Devil. The Goatman of Maryland is often associated with St. Mark the Evangelist school, in the back of the yard where an unknown "house" lies in Prince George's County, and with the nearby Glenn Dale Hospital, the former site of a state tuberculosis sanatorium. It is reported to have attacked a number of witnesses and to have damaged property. It has also been reported to have killed family pets. Reports of the Goatman began in 1957, with sightings occurring in Upper Marlboro and Forestville, Prince George's County, Maryland.
Goat: Term originally used by Gertrude Schmeidler (1943) to describe a subject who rejects the possibility that extrasensory perception could occur under the conditions of the given experimental situation; this somewhat narrow meaning has been extended to refer also, or alternatively, to persons who do not believe in the existence of ESP in general (that is, under any conditions!), or even to persons who obtain low scores on various so-called “projective,” “scalar” or “checklist” measures of belief in (and/or experience of) different sorts of putative psi phenomena. Compare Sheep. See Sheep-Goat Effect.
Goblin: A small hideous and often mischievous or evil spirit. The prefix "hob' is sometimes used to denote "good" goblins. In French folklore, goblins are wandering spirits who attach themselves to households, where they alternately help and plague the residents, depending on their whims. Goblins live in grottoes but, are attracted to homes with beautiful children and lots of wine. When they move in, they help by doing household chores by night and disciplining the children; giving them presents when they are good and punishing them when they are haughty. Goblins have an unpredictable, mischievous nature. On some nights, rather than doing chores, they will keep everyone awake by banging pots and pans, moving the furniture knocking on walls and doors, and snatching bed covers off of sleeping persons. Goblins who become bothersome can be persuaded to leave by scattering flax seed on the floor . The sprites get tired of cleaning it up every night and decide to depart for more hospitable surroundings.
Goetic Magic: A term used by the Neoplatonists (Plotinus, ca AD 205-270, and his followers) to describe "low magic", that is, magic used for profit. Goetic magic can be divided into "natural magic", magic that exploits the magical properties of natural objects; and "demonic magic", which is concerned with the coercion of spirits. Only the latter could be considered to be nigromancy, but demonic magic also includes necromancy and shamanism. "Goetism" is therefore not a suitable term to use for the practise of the summoning of demons.
Goonch: A huge type of catfish that live in Indian rivers and may have developed a taste for flesh. Locals think it has moved on from scavenging to snatching unwary bathers who venture into the Great Kali, which flows along the India-Nepal border. The extraordinary creature has been investigated by biologist Jeremy Wade for a TV documentary. Locals believe that this monster has grown extra large on a diet of partially burnt corpses. It has perhaps got this taste for flesh by feasting on remains of funeral pyres. Theories that crocodiles could be responsible for the carnage have been discounted and one is believed to have been caught which tipped the scales at 73 kilogram, (161 pounds), and was nearly 2 meters long – a world record weight and size for any catfish landed before.
Grand Grimoire: The: A grimoire, or text of instruction for use in ceremonial magic. It was supposedly edited by one Antonia del Rabina from a copy transcribed from the genuine writings of King Solomon. The Grand Grimoire is divided into two parts, the first containing the evocation of "Lucifuge Rocofale" and the second concerned with the rite of making pacts with demons. The first portion of The Grand Grimoire describes a process for evoking evil spirits to assist the operator in discovering hidden treasure. The second part suggests the surrender of the magician's body and soul to the demon, but the pact is grossly unfair to the devil, for it is such that the magician can readily slip through his fingers. The work has been regarded as one of the more atrocious grimoires.
Grassman, The: (also known as the Ohio Grassman and Kenmore Grassman) An alleged bipedal, ape-like creature reportedly seen in the state of Ohio, primarily around Kenmore near the Akron, Ohio area and throughout Eastern Ohio into Western Pa. and central and southern Ohio into WV. It was first allegedly sighted in Gallia County, Ohio in 1869. In general, scientists reject the possibility that such mega-fauna cryptids exist, because of the improbably large numbers necessary to maintain a breeding population and because climate and food supply issues make their survival in reported habitats unlikely Most accounts of Grassman describe it to be 7 to 9 feet tall, with black or brown to reddish hair, a muscular build, broad shoulders, and large hands and feet. Some think that the Grassman might be the same creature as Bigfoot. Others suggest Grassman resembles a hairy vagrant. Some who have had close encounters say the face is more human-like than ape-like, with a wide flat nose heavy brow ridge and thinner lips, human type block teeth with no fangs, but that the eyes were brown and had no whites that they could see.
Grateful Dead: Motif in folklore in which ghosts of the dead return to the world of the living to bestow rewards upon deserving people. For example, a person who pays for the funeral of a stranger my find himself being assisted by a mysterious traveler who only reveals himself to be the spirit of the corpse before vanishing. In Chinese folklore, the Grateful Dead often act a agents of social control . The purpose is to copiously reward those who gave to the corpses proper burial and their spirits continuing respect, (ensuring the continuation of ancestral worship). They also honor brave person and grace deserving relatives with drop-in visits.

Gravity Hill: Also called gravity road and magnetic hill; a convincing optical illusion where a road looks like it is sloping one way when it is actually gently sloping the other.

Gray lady: This is said to be a ghost of a human spirit that has died by the hands of a lover or is waiting for a lover to return.
Great Arcanum: The great secret that was supposed to lie behind all alchemical and magical striving. "God and Nature, alike," wrote Éliphas Lévi, "have closed the Sanctuary of Transcendent Science so that the revelation of the great magical secret is happily impossible." Elsewhere he states that it makes the magician "master of gold and light."
Green Children of Woolpit, The:  Subterraneans or fairies sighted in England in the 12th century. A girl of about ten years old, with a boy of a few years younger, were found at the mouth of a cave dressed in clothes that were unknown to anyone. Some described their clothing as being made of a strange metallic cloth. Their skin was green and the villagers that found them said that the language they spoke was like no other they had ever heard before. The children were taken to a man by the name of Richard de Calne. The people made their best effort to care for the children, but they refused to eat or drink anything for some time until they were offered fresh bean stalks. At first the children wept because they thought the stalks were empty. When they realized that the beans were still in the pods on the stalks they ate their fill of the beans very quickly and would have nothing else to eat for quite some time. The local people tried to nurse the children back to health, but about a year after finding them the boy became ill and died. The girl, on the other hand, became very healthy and some say that she lived long enough to marry and that she lived as a servant. In other stories it is said that she lived for only about five years after being found. The girl did learn the language and she told how she had gotten to the surface and gave some descriptions of her homeland.

Green Eyes: The appearance of greenish “eyes” in the dark and generally ascribed to the spirit of deceased Confederate States military personnel. Most commonly reported to be seen in areas previously part of the Confederate States of America or battle fields in non-Confederate States.
Gremlin: A small pesky spirit that was first reported during World War One. Royal Air Force pilots reported seeing. Gremlins seem to be friendly in nature , though they are wont to play poltergeist like pranks upon crew. They have varying descriptions but, most often are described as being six inches tall with horns and black leather suction boots, as a cross between a jackrabbit and a bull terrier and still others describe them as being one foot tall humanoids with ruffled red jackets and green breeches or as having webbed feet with fins on their heels. 
They are ascribed great knowledge of technology, meteorology, engineering and aerodynamics. They have been said to drink fuel, bore holes in the aircraft, bite through cables, sever fuel lines, slash wings with invisible scissors and punch and pinch gunners and bombardiers as they line up targets in their sights. They have also been blamed for poor landings by pilots. on the other hand, they have also been accredited with helping pilots to fly and land severely damaged aircraft to safety.  
The word probably originates from the combination of the word "Groggy" referring to hangovers and "Fremlin", a popular brand of beer available to U.K. and U.S. servicemen in World War One and World War two, basically being good natured insinuations that odd equipment malfunctions were the result of mechanics being mildly intoxicated while repairing them.  Others insist that the name comes from Grimms Fairy Tales.
Cases have been reported of Gremlin-like voices speaking audibly to civilian pilots, delivering instructions to turn, land or change course, and so on, in order to avoid unforeseen disasters.
Charles lindberg claimed to have encountered gremlins as vaporous forms that filled the cabin of his aircraft on his trans-Atlantic crossing. They discussed navigation and assured him of his safe arrival in Europe. He also claimed in his book The Spirit of St. Louis, (1953), that they gave him information of a "mystical nature".
Although their existence of gremlins is questionable due to the first reported cases being so recent in history, many of their attributes closely resembles that of other spirits with longer histories in folklore. They are perhaps the modern, more high tech versions of other spirits that have a fondness of living among humans such as Brownies, Goblins, Kobolds and Domoviks.

Griffin: A legendary creature with the head, beak and wings of an eagle, the body of a lion and occasionally the tail of a serpent or scorpion. Its origin lies somewhere in the Middle East where it is found in the paintings and sculptures of the ancient Babylonians, Assyrians and Persians. In Greek mythology, they took gold from the stream Arimaspias and, neighbors of the Hyperboreans, they belonged to Zeus. The later Romans used them for decoration and even in Christian times the Griffin motif often appears. Griffins were frequently used as gargoyles on medieval churches and buildings.

Grigori: The word "Grigori" derives from the Slavonic Second Book of Enoch.   A collective term for fallen angels. It was said that Grigori were sent to guide and assist man during the beginning of civilization. Sadly these angels were not suited to this job and instead of playing a positive role they began to teach man sciences that God had deemed to be forbidden. These subjects included astrology, divination, herb craft and magic. To compound this, they also began to lust after some of the women they were supposed to be guiding. In order to cohabitate with these women they even assumed physical forms. Although the church might argue that angels have no gender and therefore are unable to procreate anyway, the following excerpt from Genesis 6:4, points out that "the sons of God went to the daughters of men and had children by them". The resulting half-breeds were named as the Nephilim. This kind of bad angelic behaviour could not be tolerated and as a result the grigori were taken from their posts and imprisoned in a layer of heaven. Although they appealed to Enoch to speak on their behalf to God, they remained bound for 70 generations. As for the Nephilim, it has been suggested that one of the main reasons for the great flood, was not only to punish man, but to cleanse the earth of the half-bred creatures created from the union of fallen spirit and flesh. They are also known as “Watchers“. (See also: Watchers, The)
Grimoire: A magician's manual of black magic used for invoking demons and spirits of the dead. Some of the more common books believed by many to be authentic but, have doubtful claims are: The Secret Grimoire of Turiel claims to have been written in the 16th century, but no copy older than 1927 has been produced.A modern grimoire is the Simon Necronomicon, named after a fictional book of magic in the stories of author H. P. Lovecraft, and inspired by Babylonian mythology and the Ars Goetia, a section in the Lesser Key of Solomon which concerns the summoning of demons. The Azoëtia of Andrew D. Chumbley has been described as a modern grimoire. The Neopagan religion of Wicca publicly appeared in the 1940s, and Gerald Gardner introduced the Book of Shadows as a Wiccan Grimoire.
Grine: (Moroccan Folklore) The double of an existing person that lives in the spirit world. According to legend, each time a human is born in our world, a djinn called a Grine is born in another, adjacent world. The actions of the human inevitably influence the actions of the Grine, whereas the actions of the Grine inevitably influence those of the human.

Gualichu: (Also: gualicho)  (Mapuche mythology) and mainly in the Tehuelche culture, was an evil spirit or demon, comparable but not similar to the Devil. As the Araucanians had not a properly called god of evil, Gualichu was not worshipped but feared. He was blamed for every disease or calamity, and all evil happenings were said to be caused by him. Gualichu could enter people's body or objects and then an exorcism had to be performed to expel him (see also demon possession). He was a purely spiritual being and there is no depiction of him. He was believed to live underground. By extension the term applied to an evil spell or charm, or a jinx ("It has Gualichu"). In this sense the word has evolved into gualicho and still survives in the local folklore of Chile and Argentina in the form of a noun and a verb (engualichar, to cast an evil spell on somebody or something).
Guardian Angel: Is an angel assigned to a living person to protect them from god.

Guide, Spirit: A spirit who is believed to assist a person's spiritual journey.
Gui Po: 鬼婆- Ghosts in the form of an old lady. They are particularly concerned with matters of young children or babies. While some can appear in hideous appearance and hostile, some others look friendly and help people who are in trouble.
Gui Shu: 鬼树- This means "ghost tree". These are haunted trees which do not move but can confuse the paths of travelers by appearing in random locations, causing them to lose their way in the forests. The spirits that dwell in them do not appear to people but the mere appearance of the tree itself gives a spooky shiver to those who look at them at night.
Gwyllgi: (Welsh pronunciation: ['gw??gi]; compound noun of either gwyllt "wild" or gwyll "twilight" + ci "dog") is a mythical dog from Wales that appears as a frightful apparition of a mastiff with baleful breath and blazing red eyes. It is often referred to as "The Dog of Darkness" or "The Black Hound of Destiny"[citation needed], the apparition's favourite haunt being lonely roads at night. It is said to resemble a mastiff.