The Second Troll Legend

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

Source
is looted from the large stone tablet called Gri'lek the Wanderer, found deep underwater off the coast in the Vile Reef, northwest of the Horde camp, Grom'gol Base Camp. Once you find the "sunken city" with Saltscale murlocs, look on the outside of the wall for the tablet, on the northern corner of the wall. NOTE: There is also a second tablet on the inside of the wall, but there are murlocs guarding it so the outer tablet is the better choice. Coordinates: (24.8,22.9)

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