Twilight Lexicon

The Twilight Lexicons are books used by Twilight's Hammer Cult scribes to encode secret messages that are actually kept in three separate chapters in different locations by the Twilight Keepers to safeguard their encryption method.

Source

 * Twilight Lexicon - Chapter 1 is carried by Twilight Keeper Mayna at Twilight Post
 * Twilight Lexicon - Chapter 2 is carried by Twilight Keeper Exeter at Twilight Outpost
 * Twilight Lexicon - Chapter 3 is carried by Twilight Keeper Havunth at Twilight Base Camp

Twilight Lexicon as a Quest Objective

 * The Twilight Lexicon