Black Book: Filament and Filigree (Book)

Location
The book can found in Kolbjorn Barrow while completing the Unearthed quest. After defeating Ahzidal and confronting Ralis Sedarys, follow the south-west passage where you'll find the book on a pedestal in the next chamber.

Content
I stared at my reflection in the metal, wondering if my face had hardened to match my inner mood. I had been working the piece for days, and the forge's swelter was taking its toll. I always came to the metal shop when the dark swam over me, and today was no exception. In the midst of

Hidden Knowledge

 * Secret of Strength: Power attacks cost no stamina for 30 seconds.
 * Secret of Arcana: Spells cost no magicka for 30 seconds.
 * Secret of Protection: You take half damage for 30 seconds