Dragons' Purgatory Book

This refers to a book that contained information on Purgatory and its inhabitants. It was under the possession of dragons when it was first found.

Characteristics
It is a book with a leathery yellow cover with a cord of similar material to keep it bound. According to Bobby, it originated around the fourteenth century. Its pages were made of human skin.

Contents
Its contents were written using a very obscure Latinate to describe a supernatural dimension most commonly known as Purgatory. It depicted the place as filled with blood, bone and darkness. It also contained a ritual, or as Bobby described it, an "instruction manual" on how to open Purgatory, specifically to let Eve, the Mother of All, into earth.

Location
It was in possession of Dragons during their preparation for the crossing of Eve from Purgatory. Sam and Dean retrieved it from the sewers where the dragons were hiding. They then gave it to Bobby to find out its translated contents. It was never mentioned since and would easily have been destroyed when Bobby's house was burnt.

Appearances

 * Season 6
 * Like A Virgin