given byFel`ZerulinStonard. You will have to gather Artifacts, you can easily find those underwater in the pool around the Sunken Temple entrance. Can be done solo. Then you will get the follow-up quest, you will have to go talk to theAtal`ai Exile, he will send you back toFel`...
[55] The Essence of Eranikus (Dungeon), this quest is started by right-clicking an item you get when looting the the corpse of Shade of Eranikus, the final and hardest boss mob in the temple. This will be described later in the walkthrough. Horde: [50] The Temple of Atal'Hakkar ...