According to the Dictionnaire Infernal, Nybbas is a demon of hell who manages visions and dreams. He may be associated with the Assyrian and Babylonian god of writing, Nabu.
European Demons: List of Demons in Europe
Many of those classified as European "demons" in this list come from Greek, Roman and Norse mythologies and display trickster-like behavior (e.g. Loki) or are associated with the underworld (e.g. Hecate). Browse through profiles of demons, tricksters and evil spirits from Europe including Greek, Roman, Norse, and Scandinavian demons below. Visit the Demon FAQ for more info on my philosophy behind the classifications.
According to Collin de Plancy’s Dictionnaire Infernal, Yan-gant-y-tan is a demon from Brittany, who wanders the night holding 5 candles on his 5 fingers. Other folklore tales make reference to him as Will-o’-the-Wisp and Jack-o’-Lantern.
In Babylonian and Assyrian religions, Shedim was a generic name like the Hebrew and Christian word spirit.
Ribesal, aka Rubezal, is a specter at the summit of the Risemberg, according to the people of Silesia.
Rahovart is Satan’s companion who carries a basket that contains the soul of the curmudgeon when he is dead.