Demonology: List of Demons, Devils, Monsters & Evil Spirits

Naberius

Cerbere/ Cerberus/ Naberius is a strong and powerful demon commanding 29 legions who appears as a three headed dog or a raven.

In Hindu mythology, the Nagas/Nagis were a race of serpents whose purpose was to populate the underworld, Patalas.

In Teutonic mythology, Nicor are malignant water monsters who drown people.

Nybbas is a demon of hell who manages visions and dreams. He may be associated with the Assyrian and Babylonian god of writing, Nabu.

Onoskelis was a female demon with a beautiful form mentioned in the Testament of Solomon.

Oriax, the 59th spirit, is a great Marquis who appears in the form of a lion.

Ornias (trans. "pesky") is the first demon mentioned in the Testament of Solomon.

High prince of hell, Orobos appears in the form of a beautiful horse or as a man, who speaks of the divine essence.