The Tome of Terrin details secret martial arts techniques, the exact nature of which is unclear. It is an Italian military manual similar in nature to Sun Tzu's Art of War.

In 2057, Dunkelzahn bequeathed this tome to Yee Chan, master of the Golden Acorn Society, a group of ork physads in San Francisco. Yee Chan has been in seclusion as he attempts to unlock the Tome's secrets and train his top initiates in those techniques.

To Yee Chan, I leave the Tome of Terrin.