Tome of Fiery Arcana

The Tome of Fiery Arcana is an Alterac Valley reward.

Source
The Tome of Fiery Arcana is sold for by one of the Supply Officers for Alterac Valley:
 * Gaelden Hammersmith in Alterac Valley
 * Thanthaldis Snowgleam in Alterac Mountains
 * Grunnda Wolfheart in Alterac Valley
 * Jekyll Flandring in Alterac Mountains

Quotes

 * "The flames were so hot that flesh and steel melted like they were butter. . ."