The First Troll Legend

is a quest item only lootable by players on the quest.

Source
is looted from the large stone tablet called Moon Over the Vale, found in the Bal'lal Ruins. These ruins are almost directly north of the Horde camp, Grom'gol Base Camp, and southwest of the hunter's camp where Hemet Nesingwary Jr. can be found. The tablet is in the northwest corner of the ruins. Coordinates: (29,19)

As a Quest Objective

 * - from Brother Nimetz at the Rebel Camp in Stranglethorn Vale
 * Required:
 * The First Troll Legend
 * The Second Troll Legend
 * The Third Troll Legend
 * The Fourth Troll Legend