Book of Fenris

This refers to a book that describes Ragnarok, the end of the days.

Characteristics
It is a book with a leathery yellow cover with a paw print on the top of it. Its author is unknown.

Contents
It contained stories that detail the battle between good and evil. Atleast one story describes how Fenris will kill Odin, the chief Norse god and begin the end of the old gods.

Location
It was found by Dean in Grantsburg, Wisconsin in the possession of a cult named The Maw of Fenris. The worshipped Fenris as a god and wanted to usher in the dominance of werewolves in his name.