TheWoWDBSeems that if you complete any quests in desolace...you'll phase out and won't be able to turn this one in.
Need more research though...but I'm pretty sure this is true.
Quest
Warchief's Command: Desolace!
A World of Warcraft quest in Desolace. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Anyone had trouble with Furien actually being in the spot marked by the "?" He's not there...
Accepting a quest or completing a quest in Desolace before turning this in will make you unable to see him/turn in.
If you accepted Avenge Furien! from flying in, abandon it and he will appear (might have to run away and come back) If you completed any quest your out of luck.
Quest facts
LevelLevel 10-30
ZoneDesolace
Quest ID28548
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(28548))
Requirements
FactionHorde only
Read from the Blizzard quest API.
Description
All able bodied members of the Horde are hereby ordered to report to Furien at Tethris Aran in Desolace. The brave Horde warriors of Desolace need your help to beat back the armies of the Alliance and ancient demons. To reach Tethris Aran, travel south from the Charred Vale in the Stonetalon Mountains. Destiny calls!
Community notes from Wowhead · 19 comments
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Other Warchief's Command quests
Reward details
Reputation: Silvermoon City +10
The capital of Quel'Thalas, home of the blood elves. Though nearly destroyed by Arthas' attack on the Sunwell, Silvermoon is once again a thriving city.
Reputation group: Horde.
Other quests in Desolace that reward Silvermoon City reputation: My Time Has Passed (+25), Avenge Furien! (+10), Translation (+75), Furien's Footsteps (+250), All Becoming Clearer (+150), Firestarter (+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.