Book of Abstruse Geometries

The Book of Abstruse Geometries, written in Azlanti, is an ancient discourse on the secrets of the Dark Tapestry that includes details of dimensions, creatures, and places. The alien nature of the subject matter forces any reader of the text to be mindful of their own sanity. The book also contains a number of arcane spells pertaining to planar travel presented in the form of a wizard's spellbook. Additionally, it has directions for summoning one of a hundred named dimensional shamblers. The book is bound in whale hide, now cracked and damaged due to its extreme age; nevertheless, the book is extremely rare and valuable.