The Light and How to Swing It

The Light and How to Swing It is a quest starting item that leads to the Paladin version of the Royal Seal of Eldre'Thalas. The book was likely written by Uther the Lightbringer.

Source
The Light and How to Swing It drops from all bosses in Dire Maul, and can be found inside of Dusty Tomes in Dire Maul.