|Powers||Spell book decoder|
|Location/Owners||Men of Letters Bunker|
|Episodes|| 10.19 The Werther Project|
10.21 Dark Dynasty
10.22 The Prisoner
10.23 Brother's Keeper
11.03 The Bad Seed
11.09 O Brother Where Art Thou?
Nadya's Codex is a special codex created by a Grand Coven witch by the name of Nadya. Nadya was a gifted witch who had a knack for cracking coded texts, however Nadya was also selfish, once she cracked a code she then coded its secrets for herself, making the codex damn near indecipherable to anyone else. Nadya was hunted down by the Men of Letters, and had her life's work -- including the codex taken away. When Cuthbert Sinclair found out about the codex, he implemented a plan in secret to make sure that the Grand Coven could never get their hands on the book again by creating the Werther Box. The codex remained in the Werther Box until Sam Winchester came looking for it and was able to retrieve it.
Charlie Bradbury was able to decode the codex before her death. Charlie's Code Breaker was later used by Rowena to decode the spell that removed the Mark of Cain and to get access to Lucifer without opening Lucifer's Cage.