The Encyclopedia of the Obscure

In the Citadel of Mung there is a long forgotten library. In a dim corner of that place a massive tome rests on a dust covered lectern. The book has a simple leather cover and is completely unlabeled and unmarked. The binding and paper are of high quality but unremarkable. A scholar of the mysteries of antiquity would know it as The Encyclopedia of the Obscure, but it has no title and recognizes no author.

Perusal of its pages by one who is literate in the ancient language of its anonymous author reveals a multitude of wisdom on a dizzying array of topics. Unfortunately the tome has no recognizable organizational structure.

The Encylopedia has been deeply studied over the years and parts of it have been translated into modern tongues. Many an exegesis has been written on its arcana and works related or derivative of it are highly prized by sages and scholars everywhere?