TheWoWDBOnce you receive the [item=9530] from one of the Harpies complete the quest Dark Heart. By doing so you will know how many of each of the [npc=5362] and [npc=5366] you still need to kill in order to complete this task. Otherwise it will still show all names in red no matter how many you have killed because you still have not used the horn in your inventory.
Quest
The Northspring Menace
A World of Warcraft quest in Feralas. Facts and objectives from the current retail game data.
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The Northspring Menace http://www.youtube.com/watch?v=-Yu3Uq3d7aU
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Quest facts
LevelLevel 15-30
ZoneFeralas
Quest ID25448
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(25448))
Description
My duty here is to watch over Telaron. Even without his meditation leaving him vulnerable, there's enough threats in this forest to keep both of us on our toes. That's why it maddens me so much that I don't have the opportunity to leave camp. More harpies than I've ever seen infest the northwest...foul creatures, spreading their filth across the ancient ruins uncaringly. They're a threat to this camp, and have no place in these lands. I'll pay you well if you get rid of them.
Community notes from Wowhead · 2 comments
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Reward details
Reputation: Darnassus +150
This Alliance capital is populated by Night Elves and is located in the Island of Teldrassil. Ruled by the Priestess of the Moon, Tyrande Whisperwind.
Reputation group: Alliance.
Other quests in Feralas that reward Darnassus reputation: More Than Illness (+250), Tears of Stone (+250), The Land, Corrupted (+250), Sealing the Dream (+350), Hatecrest Forces (+250), The Gordunni Threat (+250).
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.