A demon is a supernatural being, typically associated with evil, prevalent historically in religion, occultism, literature, fiction, mythology, and folklore; as well as in media such as comics, video games, movies, anime, and television series.

The original Greek word daimon does not carry negative connotations. The Ancient Greek word δαίμων daimōn denotes a spirit or divine power, much like the Latin genius or numen. The Greek conception of a daimōn notably appears in the works of Plato, where it describes the divine inspiration of Socrates.

In Ancient Near Eastern religions and in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered a harmful spiritual entity which may cause demonic possession, calling for an exorcism. In Western occultism and Renaissance magic, which grew out of an amalgamation of Greco-Roman magic, Jewish Aggadah and Christian demonology, a demon is believed to be a spiritual entity that may be conjured and controlled 

Etymology

The Ancient Greek word δαίμων daemon denotes a spirit or divine power, much like the Latin genius or numen. Daimōn most likely came from the Greek verb daiesthai (to divide, distribute). The Greek conception of a daimōn notably appears in the works of Plato, where it describes the divine inspiration of Socrates. The original Greek word daimon does not carry the negative connotation initially understood by implementation of the Koine δαιμόνιον (daimonion), and later ascribed to any cognate words sharing the root.

The Greek terms do not have any connotations of evil or malevolence. In fact, εὐδαιμονία eudaimonia, (literally good-spiritedness) means happiness. By the early Roman Empire, cult statues were seen, by pagans and their Christian neighbors alike, as inhabited by the numinous presence of the gods: "Like pagans, Christians still sensed and saw the gods and their power, and as something, they had to assume, lay behind it, by an easy traditional shift of opinion they turned these pagan daimones into malevolent 'demons', the troupe of Satan..... Far into the Byzantine period Christians eyed their cities' old pagan statuary as a seat of the demons' presence. It was no longer beautiful, it was infested." The term had first acquired its negative connotations in the Septuagint translation of the Hebrew Bible into Greek, which drew on the mythology of ancient Semitic religions. This was then inherited by the Koine text of the New Testament. The Western medieval and neo-medieval conception of a demon derives seamlessly from the ambient popular culture of Late Antiquity. The Hellenistic "daemon" eventually came to include many Semitic and Near Eastern gods as evaluated by Christianity.

The supposed existence of demons remains an important concept in many modern religions and occultist traditions. Demons are still feared largely due to their alleged power to possess living creatures. In the contemporary Western occultist tradition (perhaps epitomized by the work of Aleister Crowley), a demon (such as Choronzon, which is Crowley's interpretation of the so-called 'Demon of the Abyss') is a useful metaphor for certain inner psychological processes (inner demons), though some may also regard it as an objectively real phenomenon. Some scholars believe that large portions of the demonology (see Asmodai) of Judaism, a key influence on Christianity and Islam, originated from a later form of Zoroastrianism, and were transferred to Judaism during the Persian era.

Ancient Egypt

Both deities and demons can act as intermediaries to deliver messages to humans.Thus they share some resemblance to the Greek daimonion. The exact definition of "demon" in Egyptology posed a major problem for modern scholarship, since the borders between a deity and a demon are sometimes blurred and the ancient Egyptian language lacks a term for the modern English "demon".However, magical writings indicate that ancient Egyptians acknowledged the existence of malevolent demons by highlighting the demon names with red ink. Demons in this culture appeared to be subordinative and related to a specific deity, yet they may have occasionally acted independently of the divine will. The existence of demons can be related to the realm of chaos, beyond the created world.But even this negative connotation cannot be denied in light of the magical texts. The role of demons in relation to the human world remains ambivalent and largely depends on context.

Ancient Egyptian demons can be divided into two classes: "guardians" and "wanderers.""Guardians" are tied to a specific place; their demonic activity is topographically defined and their function can be benevolent towards those who have the secret knowledge to face them. Demons protecting the underworld may prevent human souls from entering paradise. Only by knowing right charms is the deceased able to enter the Halls of Osiris. Here, the aggressive nature of the guardian demons is motivated by the need to protect their abodes and not by their evil essence. Accordingly, demons guarded sacred places or the gates to the netherworld. During the Ptolemaic and Roman period, the guardians shifted towards the role of Genius loci and they were the focus of local and private cults.

The "wanderers" are associated with possession, mental illness, death and plagues. Many of them serve as executioners for the major deities, such as Ra or Osiris, when ordered to punish humans on earth or in the netherworld.Wanderers can also be agents of chaos, arising from the world beyond creation to bring about misfortune and suffering without any divine instructions, led only by evil motivations. The influences of the wanderers can be warded off and kept at the borders on the human world by the use of magic, but they can never be destroyed. A sub-category of "wanderers" are nightmare demons, which were believed to cause nightmares by entering a human body.

Mesopotamia

The ancient Mesopotamians believed that the underworld was home to many demons, which are sometimes referred to as "offspring of arali". These demons could sometimes leave the underworld and terrorize mortals on earth. One class of demons that were believed to reside in the underworld were known as galla; their primary purpose appears to have been to drag unfortunate mortals back to Kur. They are frequently referenced in magical texts, and some texts describe them as being seven in number. Several extant poems describe the galla dragging the god Dumuzid into the underworld. Like other demons, however, galla could also be benevolent and, in a hymn from King Gudea of Lagash (c. 2144 – 2124 BCE), a minor god named Ig-alima is described as "the great galla of Girsu".

Lamashtu was a demonic goddess with the "head of a lion, the teeth of a donkey, naked breasts, a hairy body, hands stained (with blood?), long fingers and fingernails, and the feet of Anzû." She was believed to feed on the blood of human infants and was widely blamed as the cause of miscarriages and cot deaths. Although Lamashtu has traditionally been identified as a demoness, the fact that she could cause evil on her own without the permission of other deities strongly indicates that she was seen as a goddess in her own right. Mesopotamian peoples protected against her using amulets and talismans. She was believed to ride in her boat on the river of the underworld and she was associated with donkeys. She was believed to be the daughter of An.

Pazuzu is a demonic god who was well known to the Babylonians and Assyrians throughout the first millennium BCE.He is shown with "a rather canine face with abnormally bulging eyes, a scaly body, a snake-headed penis, the talons of a bird and usually wings." He was believed to be the son of the god Hanbi. He was usually regarded as evil, but he could also sometimes be a beneficent entity who protected against winds bearing pestilence and he was thought to be able to force Lamashtu back to the underworld.Amulets bearing his image were positioned in dwellings to protect infants from Lamashtuand pregnant women frequently wore amulets with his head on them as protection from her.

Šul-pa-e's name means "youthful brilliance", but he was not envisioned as youthful god. According to one tradition, he was the consort of Ninhursag, a tradition which contradicts the usual portrayal of Enki as Ninhursag's consort. In one Sumerian poem, offerings made to Šhul-pa-e in the underworld and, in later mythology, he was one of the demons of the underworld.

According to the Jewish Encyclopedia, "In Chaldean mythology the seven evil deities were known as shedu, storm-demons, represented in ox-like form." They were represented as winged bulls, derived from the colossal bulls used as protective jinn of royal palaces.

Abrahamic religions

Judaism

As referring to the existence or non-existence of demons (shedim or Se'irim) there are converse opinions in Judaism. There are "practically nil" roles assigned to demons in the Hebrew Bible. In Judaism today, beliefs in "demons" or "evil spirits" are either midot hasidut (Hebr. for "customs of the pious"), and therefore not halachah, or notions based on a superstition that are non-essential, non-binding parts of Judaism, and therefore not normative Jewish practice. That is to say, Jews are not obligated to believe in the existence of shedim, as posek rabbi David Bar-Hayim points out.

Tanakh

The Tanakh mentions two classes of demonic spirits, the se'irim and the shedim. The word shedim appears in two places in the Tanakh (Psalm 106:37, Deuteronomy 32:17). The se'irim are mentioned once in probably a re-calling of Assyrian demons in shape of goats. The shedim in return are not pagan demigods, but the foreign gods themselves. Both entities appear in a scriptural context of animal or child sacrifice to "non-existent" false gods.

From Chaldea, the term shedu traveled to the Israelites. The writers of the Tanach applied the word as a dialogism to Canaanite deities.

There are indications that demons in popular Hebrew mythology were believed to come from the nether world. Various diseases and ailments were ascribed to them, particularly those affecting the brain and those of internal nature. Examples include catalepsy, headache, epilepsy and nightmares. There also existed a demon of blindness, "Shabriri" (lit. "dazzling glare") who rested on uncovered water at night and blinded those who drank from it.

Demons supposedly entered the body and caused the disease while overwhelming or "seizing" the victim. To cure such diseases, it was necessary to draw out the evil demons by certain incantations and talismanic performances, at which the Essenes excelled. Josephus, who spoke of demons as "spirits of the wicked which enter into men that are alive and kill them", but which could be driven out by a certain root, witnessed such a performance in the presence of the Emperor Vespasian and ascribed its origin to King Solomon. In mythology, there were few defences against Babylonian demons. The mythical mace Sharur had the power to slay demons such as Asag, a legendary gallu or edimmu of hideous strength.

Second Temple period texts

To the Qumran community during the Second Temple period this apotropaic prayer was assigned, stating: "And, I the Sage, declare the grandeur of his radiance in order to frighten and terri[fy] all the spirits of the ravaging angels and the bastard spirits, demons, Liliths, owls" (Dead Sea Scrolls, "Songs of the Sage," Lines 4–5).

In the Dead Sea Scrolls, there exists a fragment entitled "Curses of Belial" (Curses of Belial (Dead Sea Scrolls, 394, 4Q286(4Q287, fr. 6)=4QBerakhot)). This fragment holds much rich language that reflects the sentiment shared between the Qumran towards Belial. In many ways this text shows how these people thought Belial influenced sin through the way they address him and speak of him. By addressing "Belial and all his guilty lot," (4Q286:2) they make it clear that he is not only impious, but also guilty of sins. Informing this state of uncleanliness are both his "hostile" and "wicked design" (4Q286:3,4). Through this design, Belial poisons the thoughts of those who are not necessarily sinners. Thus a dualism is born from those inclined to be wicked and those who aren't. It is clear that Belial directly influences sin by the mention of "abominable plots" and "guilty inclination" (4Q286:8,9). These are both mechanisms by which Belial advances his evil agenda that the Qumran have exposed and are calling upon God to protect them from. There is a deep sense of fear that Belial will "establish in their heart their evil devices" (4Q286:11,12). This sense of fear is the stimulus for this prayer in the first place. Without the worry and potential of falling victim to Belial's demonic sway, the Qumran people would never feel impelled to craft a curse. This very fact illuminates the power Belial was believed to hold over mortals, and the fact that sin proved to be a temptation that must stem from an impure origin.

In Jubilees 1:20, Belial's appearance continues to support the notion that sin is a direct product of his influence. Moreover, Belial's presence acts as a placeholder for all negative influences or those that would potentially interfere with God's will and a pious existence. Similarly to the "gentiles ... [who] cause them to sin against you" (Jubilees 1:19), Belial is associated with a force that drives one away from God. Coupled in this plea for protection against foreign rule, in this case the Egyptians, is a plea for protection from "the spirit of Belial" (Jubilees 1:19). Belial's tendency is to "ensnare [you] from every path of righteousness" (Jubilees 1:19). This phrase is intentionally vague, allowing room for interpretation. Everyone, in one way or another, finds themselves straying from the path of righteousness and by pawning this transgression off on Belial, he becomes a scapegoat for all misguidance, no matter what the cause. By associating Belial with all sorts of misfortune and negative external influence, the Qumran people are henceforth allowed to be let off for the sins they commit.

Belial's presence is found throughout the War Scrolls, located in the Dead Sea Scrolls, and is established as the force occupying the opposite end of the spectrum of God. In Col. I, verse 1, the first line of the document, it is stated that "the first attack of the Sons of Light shall be undertaken against the forces of the Sons of Darkness, the army of Belial" (1Q33;1:1). This dichotomy sheds light on the negative connotations that Belial held at the time. Where God and his Sons of Light are forces that protect and promote piety, Belial and his Sons of Darkness cater to the opposite, instilling the desire to sin and encouraging destruction. This opposition is only reinforced later in the document; it continues to read that the "holy ones" will "strike a blow at wickedness", ultimately resulting in the "annihilation of the Sons of Darkness" (1Q33:1:13). This epic battle between good and evil described in such abstract terms, however it is also applicable to everyday life and serves as a lens through which the Qumran see the world. Every day is the Sons of Light battle evil and call upon God to help them overcome evil in ways small and large.

Belial's influence is not taken lightly. In Col. XI, verse 8, the text depicts God conquering the "hordes of Belial" (1Q33;11:8). This defeat is indicative of God's power over Belial and his forces of temptation. However the fact that Belial is the leader of hordes is a testament to how persuasive he can be. If Belial was obviously an arbiter of wrongdoing and was blatantly in the wrong, he wouldn't be able to amass an army. This fact serves as a warning message, reasserting God's strength, while also making it extremely clear the breadth of Belial's prowess. Belial's "council is to condemn and convict", so the Qumran feel strongly that their people are not only aware of his purpose, but also equipped to combat his influence (1Q33;13:11).

In the Damascus Document, Belial also makes a prominent appearance, being established as a source of evil and an origin of several types of sin. In Column 4, the first mention of Belial reads: "Belial shall be unleashed against Israel" (4Q266). This phrase is able to be interpreted myriad different ways. Belial is characterized in a wild and uncontrollable fashion, making him seem more dangerous and unpredictable. The notion of being unleashed is such that once he is free to roam; he is unstoppable and able to carry out his agenda uninhibited. The passage then goes to enumerate the "three nets" (4Q266;4:16) by which Belial captures his prey and forces them to sin. "Fornication ..., riches ..., [and] the profanation of the temple" (4Q266;4:17,18) make up the three nets. These three temptations were three agents by which people were driven to sin, so subsequently, the Qumran people crafted the nets of Belial to rationalize why these specific temptations were so toxic. Later in Column 5, Belial is mentioned again as one of "the removers of bound who led Israel astray" (4Q266;5:20). This statement is a clear display of Belial's influence over man regarding sin. The passage goes on to state: "they preached rebellion against ... God" (4Q266;5:21,22). Belial's purpose is to undermine the teachings of God, and he achieves this by imparting his nets on humans, or the incentive to sin.

In the War of the Sons of Light Against the Sons of Darkness, Belial controls scores of demons, which are specifically allotted to him by God for the purpose of performing evil. Belial, despite his malevolent disposition, is considered an angel.

Talmudic tradition

In the Jerusalem Talmud notions of shedim ("demons" or "spirits") are almost unknown or occur only very rarely, whereas in the Babylon Talmud there are many references to shedim and magical incantations. The existence of shedim in general was not questioned by most of the Babylonian Talmudists. As a consequence of the rise of influence of the Babylonian Talmud over that of the Jerusalem Talmud, late rabbis in general took as fact the existence of shedim, nor did most of the medieval thinkers question their reality. However, rationalists like Maimonides, Saadia Gaon and Abraham ibn Ezra and others explicitly denied their existence, and completely rejected concepts of demons, evil spirits, negative spiritual influences, attaching and possessing spirits. Their point of view eventually became mainstream Jewish understanding.

Kabbalah

In Kabbalah demons are regarded a necessary part of the divine emanation in the material world and a byproduct of human sin (Qliphoth). However spirits such as the shedim may also be benevolent and were used in kabbalistic ceremonies (as with the golem of Rabbi Yehuda Loevy) and malevolent shedim (Mazikin, from the root meaning "to damage") were often credited with possession.

Aggadah

Aggadic tales from the Persian tradition describe the shedim, the mazziḳim ("harmers"), and the ruḥin ("spirits"). There were also lilin ("night spirits"), ṭelane ("shade", or "evening spirits"), ṭiharire ("midday spirits"), and ẓafrire ("morning spirits"), as well as the "demons that bring famine" and "such as cause storm and earthquake". According to some aggadic stories, demons were under the dominion of a king or chief, either Asmodai or, in the older Aggadah, Samael ("the angel of death"), who killed via poison. Stories in the fashion of this kind of folklore never became an essential feature of Jewish theology. Although occasionally an angel is called satan in the Babylon Talmud, this does not refer to a demon: "Stand not in the way of an ox when coming from the pasture, for Satan dances between his horns".

Christianity

Old Testament

Demonic entities in the Old Testament of the Christian Bible are of two classes: the "satyrs" or "shaggy goats" (from Hebr. se'irim "hairy beings", "he-goats" or "fauns"; Isaiah 13:21, 34:14) and the "demons" (from Hebr. shedim first translated as Greek: δαιμόνιον daimonion, "daemon"; 106:35–39, 32:17).

New Testament

The term demon (from the Koine Greek δαιμόνιον daimonion) appears 63 times in the New Testament of the Christian Bible, mostly if not all relating to occurrences of possession of individuals and exorcism by Jesus.

The King James Version kept it translated as devil. The word devil by itself is the translation word for the Greek diabolos which occurs 38 times in the New Testament. The Tyndale Bible (1526 CE), a precursor of KJV, translated it all as devyl, including Act 17:18 as newe devyls.

Pseudepigrapha and deuterocanonical books

Demons are included into biblical interpretation. In the story of Passover, the Bible tells the story as "the Lord struck down all the firstborn in Egypt" (Exodus 12:21–29). In the Book of Jubilees, which is considered canonical only by the Ethiopian Orthodox Church, this same event is told slightly differently: "All the powers of [the demon] Mastema had been let loose to slay all the first-born in the land of Egypt...And the powers of the Lord did everything according as the Lord commanded them" (Jubilees 49:2–4).

In the Genesis flood narrative the author explains how God was noticing "how corrupt the earth had become, for all the people on earth had corrupted their ways" (Genesis 6:12). In Jubilees the sins of man are attributed to "the unclean demons [who] began to lead astray the children of the sons of Noah, and to make to err and destroy them" (Jubilees 10:1). In Jubilees Mastema questions the loyalty of Abraham and tells God to "bid him offer him as a burnt offering on the altar, and Thou wilt see if he will do this command" (Jubilees 17:16). The discrepancy between the story in Jubilees and the story in Genesis 22 exists with the presence of Mastema. In Genesis, God tests the will of Abraham merely to determine whether he is a true follower, however; in Jubilees Mastema has an agenda behind promoting the sacrifice of Abraham's son, "an even more demonic act than that of the Satan in Job." In Jubilees, where Mastema, an angel tasked with the tempting of mortals into sin and iniquity, requests that God give him a tenth of the spirits of the children of the watchers, demons, in order to aid the process. These demons are passed into Mastema's authority, where once again, an angel is in charge of demonic spirits.