This might not be the case for everyone, but for me the reason I could not accept a "Back to the Cove" quest is because I had accepted the quest "Defending the Rift". Once I abandoned that quest, I was able to pick up the quest "Back to the Cove" and after turning it in accept "Defending the Rift" again.
Quest
Back to Darkbreak Cove
A World of Warcraft quest in Abyssal Depths. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
R.I.P. L'ghorek. :(
Darkbreak cove is located at 60:77
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(26181))
Requirements
Read from the Blizzard quest API.
Description
YOU MUST RETURN... TO... THE DARKBREAK COVE. ERUNAK STONESPEAKER AWAITS... YOU WITHIN. I DIE NOW....
Community notes from Wowhead · 12 comments
Top 3 shown aboveThe comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
The top 3 are shown in Top Comments above. Read all 12 on Wowhead.
Reward details
Reputation: The Earthen Ring +25
This gathering of the most powerful shaman of Azeroth seeks to maintain the balance between the world's elemental forces. Their main focus during the cataclysm has been to repair and stabilize the damage caused by Deathwing's arrival.
Reputation group: Cataclysm.
Other quests in Abyssal Depths that reward The Earthen Ring reputation: Free Wil'hai (+350), Into the Totem (+250), Scalding Shrooms (+250), ... It Will Come (+350), Unplug L'ghorek (+250), Back to the Tenebrous Cavern (+25).
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.