Slightly reworded (for brevity) from the back cover of the "Gloranthan Classics" version.
Griffin Mountain was the largest game adventure when it was first printed. It is a complete depiction of Balazar a section of Glorantha just north of Dragon Pass. This is a reprint of the original supplement and also includes several articles printed in magazines and over 35 new pieces of art, designer's notes and a treatise on Running A Gloranthan Campaign by Greg Stafford.