The Ars Goetia (often called just Goetia) is the first section of The Lesser Key of Solomon, an anonymously-written, 17th century book on demonology. It described 72 demons that King Solomon of the Hebrew Bible summoned, trapped, and enslaved. Each demon has its own seal. The subordinates of Ruby Eye Shabranigdu are roughly based on the demons of the Ars Goetia. See Plane chart for comparison.