The book can found in Kolbjorn Barrow while completing the quest "Unearthed." After defeating Ahzidal and confronting Ralis Sedarys, a passage to the southwest opens. Through that passage, the book is on a pedestal in the next chamber.
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
- Secret of Strength: Power attacks cost no stamina for 30 seconds.
- Secret of Arcana: Spells cost no magicka for 30 seconds.
- Secret of Protection: Reduces damage by half for 30 seconds.
- The room this book is found in has a statue of Hermaeus Mora greatly resembling Hermaeus Mora's Shrine, found in The Elder Scrolls IV: Oblivion.
- If the cursor is hovered in the black book at the Apocrypha it will say "Return to Solstheim" but it is only the middle area that can teleport the Dragonborn into Solstheim when interacted with (could be bug).