Semyaza is the leader of the fallen Watchers — the chief of the two hundred angels who descended to earth and broke their celestial trust. In the Book of Enoch he is the instigator and captain of the great angelic rebellion of desire, the one who bound his fellows to their fatal oath. His name is read as “the heaven sees” or “my name has seen,” a fitting irony for a watcher who fell.
The Captain of the Watchers
When the [grigori], beholding the beauty of mortal women, conceived their forbidden desire, it was Semyaza who led them — yet who also hesitated. “I fear,” he said, “that you will not agree to do this deed, and I alone shall have to pay the penalty of a great sin.” So he bound them all by a mutual oath upon Mount Hermon, that they should descend together and share the guilt as one. Two hundred angels swore the oath, and by it they were all condemned together — the very mountain’s name, Hermon, was said to commemorate the curse (herem) they swore upon it.
The Teacher of Corruption
Having descended, Semyaza took mortal wives and, with his companion [azazel] and the other chiefs, loosed ruin upon the world. Semyaza himself is named as the teacher of enchantments and root-cuttings — sorcery and the magical use of plants — while his fellows taught metalwork, weaponry, astrology, and the other forbidden arts. From the unions of the Watchers came the giant [nephilim], whose violence drowned the earth in blood.
The Hanging Judgment
For his sin Semyaza suffered a fate as striking as his crime. Tradition holds that the fallen leader was bound and suspended head-downward between heaven and earth, hung in the sky as a perpetual sign of his fall — identified in some readings with the constellation Orion, the giant chained forever in the heavens he betrayed. As the first and foremost of the fallen angels, Semyaza stands as a prototype of Lucifer himself: the high one who, given the freedom to watch over creation, chose desire and dragged a host down with him into ruin.