Soulblight Stone (WAR History and Lore)  

In the big swampy area just northeast of Blackbramble Hollow, on an island in the eastern side of the body of water there is a group of dead maurauders lying between a rock and a tree. One of the Dead Maurauders (50k/54k) can be clicked on to obtain the tome unlock.

History & Lore in Troll Country