Rivenwood is found directly north of the Steel Gate just past the road (30,20 is where I started). You need to find Riven Widow Cocoon. When you open them you have a chance at getting the Freed Winterhoof Longrunner that you need.
This quest very similar to Taken in the Night.
Quest
Rivenwood Captives
A World of Warcraft quest in Howling Fjord. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Very low "drop" rate on rescues, it was a frustrating quest for me.
This was a very intelligent plan on the spiders' part:
Step 1: Kidnap female tauren.
Step 2: Milk female tauren.
Step 3: Sell milk.
Step 4: Profit.
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(11296))
Requirements
Read from the Blizzard quest API.
Description
Something, most likely the walking dead known as the Scourge, has agitated the creatures hereabouts. While escorting the sage here, we lost most of our hunting force to the riven widows -- huge and deadly spiders, which inhabit the Rivenwood to the north. I must stay here to protect the small force we have left, but you... you could see if my longrunners are still alive, trapped within the riven widow's cocoons. Would you do this, stranger?
Community notes from Wowhead · 53 comments
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Reward details
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Reputation: The Taunka +250
These hardy people are cousins of the Tauren and have become valuable scouts for the armies of the Horde as they march northward.
Reputation group: Horde Expedition.
Other quests in Howling Fjord that reward The Taunka reputation: Skorn Must Fall! (+10), Gruesome, But Necessary (+250), Burn Skorn, Burn! (+250), Towers of Certain Doom (+250), Stop the Ascension! (+350), The Conqueror of Skorn! (+350).
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.