Goetic magick (or the Goetia) is a system of "demonic" magick based on the first part of The Lesser Key of Solomon. This system gives specific instructions for evoking (conjuring to one's exterior) one of 72 entities described in the book. Although it is not explicitly stated in the lesser key, this system will also work on other entities not described in the book. Though described as demons by the early magickians, Goetic spirits actually serve many useful functions to those with the fortitude to summon and command them properly.