TheWoWDBApparently, you must do this quest in order to meet Vex'tul, who is needed for the Full Caravan achievement.
Edit: The reason given for this is that Vex'tul was a former follower of Zaeldarr.
Quest
Zaeldarr the Outcast
A World of Warcraft quest in Eastern Plaguelands. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Long respawn on this npc...
This gives reputation towards the Argent Crusade, not Dawn. Little mix up for you. :)
Quest facts
LevelLevel 15-30
Quest ID27432
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(27432))
Description
Can you believe that, after all the trouble we have in the Plaguelands... we have to worry about thieves too? And not just normal thieves, troll thieves. And not just normal troll thieves. Dead troll thieves! They're led by this big, dead troll named Zaeldarr the Outcast, and they come here at night and steal bodies from our graveyards, then take them back to their evil, dead troll hideout--the Undercroft to the southwest. Go there and take out Zaeldarr, {name}. I'm sick to death of his mischief!
Community notes from Wowhead · 12 comments
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Reward details
Reputation: Argent Crusade +250
Led by Tirion Fordring, the Argent Crusade combines the reformed Order of the Silver Hand with the Argent Dawn in one final push against the forces of the Lich King.
Reputation group: Wrath of the Lich King.
Other quests in Eastern Plaguelands that reward Argent Crusade reputation: Rough Roads (+350), Frederick's Fish Fancy (+250), To Kill With Purpose (+250), Dark Garb (+250), Catalysm (+250), Just a Drop in the Bucket (+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.