Demonology is the systematic study of demons or beliefs about demons. It is the branch of theology relating to supernatural beings who are not gods. It deals both with benevolent beings that have no circle of worshippers or so limited a circle as to be below the rank of gods, and with malevolent beings of all kinds. The original sense of “demon”, from the time of Homer onward, was a benevolent being, but in English the name now holds connotations of malevolence. (In order to keep the distinction, when referring to the word in its original Greek meaning English uses the spelling “Daemon” or “Daimon”.)
Demons, when regarded as spirits, may belong to either of the classes of spirits recognized by primitive animism; that is to say, they may be human, or non-human, separable souls, or discarnate spirits which have never inhabited a body. A sharp distinction is often drawn between these two classes, notably by the Melanesians, several African groups, and others; the Arab jinn, for example, are not reducible to modified human souls; at the same time these classes are frequently conceived as producing identical results, e.g. diseases.
Here are just a few some with descriptions others with none. But remember they are many they are Legion. If you know any descriptions of those below your welcome too add them in the comment box just be sure to use the number of the picture in the comment.
According to le Grand Grimoire, Baal (or Bael) is the head of the infernal powers. He is also the first demon listed in Wierus’ Pseudomonarchia daemonum. According to Wierus, Bael is first king of Hell with estates in the east. He has three heads: a toad, a man, and a cat. He also speaks in a raucous, but well formed voice, and commands 66 legions. Bael teaches the art of invisibility, and may be the equivalent of Baal, one of the Seven princes of Hell.
According to the Goetia, Andras was a Grand Marquis of Hell, appearing with a winged angel‘s body and the head of an owl or raven, riding upon a strong black wolf and wielding a sharp and bright sword. He was also responsible for sowing discord, and commanded 30 infernal legions. He is the 63rd of the 72 spirits of Solomon.
Andras was considered to be a highly dangerous demon, who could kill the conjuring magician and his assistants if precautions were not taken.
The Dutch demonologist Johannes Wier, in his Pseudomonarchia Daemonum, says of Andras:
“Andras is a great marquesse, and seemes in an angels shape with a head like a blacke night raven, riding upon a blacke and a verie strong woolfe, flourishing with a sharpe sword in his hand, he can kill the maister, the servant, and all assistants, he is author of discords, and ruleth thirtie legions.”
Another demonologist, Collin de Plancy, also mentions Andras in his writings:
“Grand Marquis of Hell. He appears to have the body of an angel and the head of a wood owl, and to be riding a black wolf and carrying in his hand a pointed saber. He teaches those whom he favors to kill their enemies, masters and servants. He stirs up trouble and dissension. He commands thirty legions.”
Marchosias (also Marchocias) is a powerful Great Marquis of Hell, commanding thirty legions of demons. He is a strong and excellent fighter and very reliable to the conjurer, giving true answers to all questions. Marchosias hoped after one thousand and two hundred years to return to heaven with the non-fallen angels, but he is deceived in that hope.
The name Marchosias comes from Late Latin marchio, marquis.