. The True Story of the Forbidden Ones...

The characters in the novels share the names of the original beings.

Spelling differs from text to text, but the names Storm has retained are recognizable.
 

Enoch 1: Semyaza, Azazel, Sarial, Rumiel, Danjal, Turel, Kokabel.
Ginzberg; Legend of the Jews: Shemhazai, Armaros, Barakel, Kawkabel, Ezekeel, Arakiel, Samsaweel, Seriel.

See anyone you know?
 
 

The story of their fall also differs from expert to expert as can be seen from the essay below by Gréchon Léigh 1998

William Auvergne, bishop of Paris (1228-1249), in his De Universo, held that of the 9 orders of Angels that were created a "10th part fell" some from each order, and that in their fallen state they retained their relative ranks.

According to Cardnial Bishop of Tusculum (1273), reaffirmed by Alphonso de Spina (c. 1460) the one third that fell totaled 133,306,668, those that remained totaled 266,613,336.

As opposed to the contention that angels fell from each of the 9 orders, an opinion backed by papal authority holds that the angels of the 10th (sic) order fell.

The question is, which of the nine orders is the tenth.

Moore quotes Tertullian to the effect that all the chief luxuries of female adornment and enticement - "the necklaces, armlets, rouge, and black powder for lashes" are to be traced to the discovery of fallen angels.

After the apostate angles fell, "the rest were confirmed in the perseverence of eternal beautitude" as Isidor of Seville assures in his Sententiae - Although Bible references to God's finding his angels untrustworthy point to a contrary conclusion.

The cause of Satan's downfall has often been attributed to the sin of pride or ambition.

Another explanation sometimes offered with regard to the origion of fallen angels goes back to Genesis 6, where the sons of God (angels) "Saw the daughters of men...and took them wives" from among them.

Enoch saw 7 great stars like burning mountains which were being punished because the failed to rise at the appointed time.
In early writings, fallen angels were said to be shooting stars.

Aquinas identified the fallen angels with demons.  The Christian writers of the later middle ages looked upon all "heathen" dvinities as demons.  In most sources, the leader of the Apostates is Satan, but in apocryphal writings the leader has also been called Mastena, Beliar, Azazel, Belzebub, Sammael, ect.

In Mohammedan lore he is Iblis.  In Levi 3 the fallen angels are "imprisoned in the 2nd heaven."  Enoch II, 7:1 also speaks of fallen angels in the 2nd heaven as "prisoners suspended there reserved for and waiting the eternal judgement."

Caird says in Principalities and Powers, "It is on account of mankind that angels fell" and cites Apocalypse of Burach which goes so far to say that it was "The physical nature of man which not only became a danger to his own soul, but resulted in the fall of the angels."

According to legend the angels fell for 9 days.

Information about the Grigori/The Watchers/The Fallen Angels/The Nephilim
(all these names apply) is abundant on the internet, so listing it all here is not necessary.

Typing any of above names into a seach engine will yield a multitude of fruit for those who would like to explore the idea of these creatures further.

I recommend www.google.com as an excellent starting place.

Therefore, I will merely add meat to bare bones and commend you to your search.....
 

THE NEPHILLIM

The offspring of the group of angels known as Watchers  who came to earth to have sexual relations with women.
Their children, the Nephillim, became fierce, evil, giant mutants, who were hated by the people.

They were said to have consumed so much food that the people grew tired of feeding them.
They then began to eat birds, large and small animals, reptiles, fish, and they drank blood.
They eventually turned on the people and began to eat them as well. In 1 Enoch, God referred to them as "evil spirits".

The Book of Genesis 6:4 also speaks of Nephillim: "In those days, there were giants on the earth who were descendants of human women and the heavenly beings."

The First Book Enoch 15:8 tells us, "But now the giants who are born from the [union of the ] spirits and the flesh shall be called evil spirits upon the earth."

The Nephillim are also said to be responsible for the building of the Tower of Babel.
Four hundred and nine thousand of them were destroyed during the great flood.
Once their physical bodies were destroyed, their spiritual bodies continued to dwell on earth.
They are thought to be some of the evil spirits that roam the earth. They are also called the Anakim.

A variation of the name Nephillim is Nephilim.
 

WATCHERS
An order of angels also called the Grigori. The Watchers were given the responsibility of being the teachers of humanity, also working with the archangels in creating Paradise.

They fell from grace when they were attracted to the women of earth and about twelve thousand years ago, two hundred of the Watchers left their positions in Heaven to come to the earth to have sexual relations with women.

Out of fear of God they made a pact amongst themselves that they would commit themselves to the act.

"And Semyaza, being their leader said unto them, `I fear that perhaps you will not consent that this deed should be done, and I alone will become [responsible] for this great sin.'

But they all responded to him, `Let us all swear an oath and bind the deed.'

Then they all swore together and bound one another by [the curse]." (Book of 1 Enoch 6:3-4)
 

They descended upon Mount Sinai (The mountain in the Old Testament where Moses first encountered the Angel of the Lord in a burning bush. It is also the place where Moses received the tablets that held the Ten Commandments from God) taking on fleshly bodies.

Genesis 6:2 says "When people began to multiply on the face of the ground, and daughters were born to them, the sons of God saw that they were fair; and they took wives for themselves of all that they chose."

The Book of 1 Enoch 6:1-2 states, "In those days when all the children of man had multiplied, it happened that there were born unto them beautiful daughters. And the angels, the children of Heaven, saw them and desired them; and they said to one another, `Come, let us choose wives for ourselves from among the daughters of man and beget us children.'"

From their union with women, they produced children called the Nephillim who turned out to be evil giants.

It is because of the Nephilim that God sent out the deluge (the great downpour/flood) and according to one account, the Watchers shed their bodies and returned to the spiritual realm once the flood came.

The leaders of the Watchers who came to the earth were named Azaz'el (their chief), Arakeb, Rame'el, Tam'el, Ram'el, Dan'el, Ezeqel, Baraqiyal, Asel, Armaros, Batar'el, Anan'el, Zaqe'el, Sasomaspe'el, Kestar'el, Tur'el, Yamayol, and Arazyal.

The leader of the leaders was named Shemyaza.

While on earth the Watchers taught their wives many things. Much of this was knowledge forbidden to humans.

The Book of  Enoch1 details much about this saying, "And they took wives unto themselves, and everyone chose one woman for himself, and they began to go unto them. And they taught them magical medicine, incantations, the cutting of roots, and taught them about plants." (l Enoch 7:1-2)

After their descent to earth the Watchers were never allowed to enter Heaven again.