Enochian magic is the system of theurgy, or angel magic, communicated to the Elizabethan mathematician, geographer, astrologer and magician, Dr. John Dee (1527-1608) through the medium of his crystal scryer, the alchemist and necromancer Edward Kelley (1555-1595) by a hierarchy of spiritual intelligences who identified themselves as the same angels that had instructed the biblical patriarch Enoch in the occult wisdom of heaven.
Enoch is the fabled author of a number of mystical and magical texts that deal largely with the fallen angels of God, known collectively as the Watchers, whose task it was to watch over humanity from the four Watchtowers at the corners of creation. These Watchers observed that human women were beautiful and lusted after them. A group of Watchers, led by an angel known by a variety of names, among them Azazel, descended to the earth and adopted material forms so that they could dwell with mortal women. Their consorts bore them sons and daughters who were half-human and half-angelic.
The sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.... There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown. (Genesis 6:2,4)
What the Bible neglects to say is that in return for the pleasure of their company, these fallen Watchers taught the women they loved, along with their half-breed descendants, the beginnings of all the arts and sciences that have so transformed the world in the modern age. They also taught enchantments, spells, the making of talismans and amulets, bewitchments, fascinations, glamours, the knowledge of the occult use of herbs and stones, astrology, and other esoteric arts. The use of cosmetics by women is ascribed to the teachings of the Watchers, who presumably wished their consorts to be more alluring.
More destructively, the Watchers taught their descendants the arts of warfare in order that they could rules as kings over all the lands of the earth. The mighty sons of the Watchers fell into contention with each other, and chaos reigned. The sons of the fallen angels, of which the first generation were known as giants because of their great wisdom and power, were regarded as devils by ordinary human beings. From the union of the daughters of the Watchers with those same Watchers, mortal men and women of great power and intelligence were born; from the union of the sons of the Watchers with those same Watchers (who are both male and female, being angels) spiritual creatures of male and female appearance possessing the power to rule over the earthly elements came forth.
The rule in magic is that from the sexual union between a spirit and a man, a spiritual creature with human qualities is born out of the womb of the spirit; but from the sexual union between a spirit and a woman, a human child with spiritual qualities is born out of the womb of the woman. Merlin falls into the second category -- he was the product of a union between a mortal woman and a spirit. As a practical matter, the offspring between an angel and a mortal woman must have a physical matrix or basis to inhabit before it can fully become flesh -- it must possess an embryo within its mother that was conceived in the usual way with a mortal man.
In this passage quoted from the Book of Enoch, the author explains these matters, though not so clearly as I have done, to his readers by having God speak to the fallen Watchers:
"But you were formerly spiritual, living the eternal life, and immortal for all generations of the world. And therefore I have not appointed wives for you; for as for the spiritual ones of the heaven, in heaven is their dwelling. And now, the giants, who are produced from the spirits and flesh, shall be called evil spirits upon the earth, and on the earth shall be their dwelling. Evil spirits have proceeded from their bodies; because they are born from men and from the holy Watchers is their beginning and primal origin; they shall be evil spirits upon earth, and evil spirits shall they be called. And the spirits of the giants afflict, oppress, destroy, attack, do battle, and work destruction on the earth, and cause trouble: they take no food, but nevertheless hunger and thirst, and cause offenses. And these spirits shall rise up against the children of men and against the women, because they have proceeded from them. From the days of the slaughter and destruction and death of the giants, from the souls of whose flesh the spirits, having gone forth, shall destroy without incurring judgement -- thus shall they destroy until the day of the consummation, the great judgement in which the age shall be consummated, over the Watchers and the godless, yea, shall be wholly consummated."
The biblical Flood was caused to cover the earth by God in order to cleanse it of the tragic creations of humanity, who used the occult arts taught by the Watchers to bring about chaos and destruction. However, Noah and his family survived, the animals and plants survived, and so did a number of the spiritual children of the children of the Watchers.
The Enochian angels informed John Dee that they intended to instruct him in the same magic they had taught to Enoch after his living ascent into heaven. This was similar to the original angel magic taught by the Watchers to the daughters of men and their children. However, the angels informed Dee that their magic was pure, whereas the magic taught by the Watchers had been tainted black magic.