The Ars Theurgia Goetia (The theurgia [a type of ritual to invoke ghosts or spirits] to Practise the Goetia), second part of The Lesser Key of Solomon, explains the names, characteristics and seals of the 31 aerial spirits (called chiefs, emperors, kings and princes) that King Solomon invoked and confined, the protections against them, the names of their servant spirits, called dukes, the conjurations to invoke them, and their nature, that is both good and evil.
Their sole objective is to discover and show hidden things, the secrets of any person, and obtain, carry and do anything asked to them meanwhile they are contained in any of the four elements (Earth, Fire, Air and Water) These spirits are given in a complex order in the book, and some of them have spelling variations according to the different editions.
