To complete this quest, you must extract the items from the bag of supplies given to you from Eridan Bluewind and take them to Tanaris. It is recommended that you take the items out of the bag before making the journey, as it is possible to lose the items if someone has recently summoned Aquementas. Head to Lost Rigger Cove in Tanaris (far east side), and just southwest of the pirate fort will be a circle of stones surrounded by the mountains. Use the Book of Aquor there with the other items to summon Aquementas.