"This substantial volume deals with Glorantha’s myriad cults.
It is not exhaustive: many Gloranthan societies have small,
sometimes tiny, local cults that, whilst important to that society, have little consequence in the great scheme of Glorantha’s destiny. However this book is comprehensive: within these pages you will find details of theistic (divine) cults, sorcerous orders, ancestor and spirit cults, as well as many other peculiar cults each with a certain degree of importance."
Text from the introduction page of the book/pdf