There's a heap of corrupted Treants that drop this bark around 50,74.
Quest
Victims of Corruption
A World of Warcraft quest in Bloodmyst Isle. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
This quest has one of the most obnoxiously low drop rates in the entire zone, if not the most. I've levelled several characters through this zone for gear, and it was common to kill ten of the treants and not see a single piece of bark.
My theory is the quest is psychic because whenever I think 'I need to go check the droprates on wowhead again' two of the damn bark pieces drop in a row.
The only saving grace is that the treants respawn quickly, but don't bother trying this quest in any other area than Middenvale.
I've done this quest many times but never so fast as today. At coords of 36, 75 (in the Nazzivian area) there is a huge red crystal in the ground. It looks like a giant red pineapple. Surrounding it are four of the diseased treants. They respawn quickly. By the time you kill the four, four more appear. I got all six of the Crystallized Bark in about ten minutes. Normally it takes hours of wandering the map.
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(9574))
Requirements
Read from the Blizzard quest API.
Description
Bloodmyst Isle was forever changed by our arrival. The Exodar's crash scattered debris all over the islands and I think it's beginning to have an adverse effect on the wildlife. Before I can be certain of my conclusion, I'll need to get a closer look. The crystals seem to have affected the trees the fastest, so it seems that the treants would be the most likely to show symptoms. If you bring me samples of bark from corrupted treants, I can begin my in-depth studies.
Community notes from Wowhead · 48 comments
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Reward details
Reputation: Exodar +250
The naaru vessel that brought the draenei to Azeroth. Though stranded in the Azuremyst Isles, it acts as a home city for this noble race.
Reputation group: Alliance.
Other quests in Bloodmyst Isle that reward Exodar reputation: Deciphering the Book (+250), Know Thine Enemy (+250), Containing the Threat (+250), Cruelfin's Necklace (+250), Searching for Galaen (+250), Galaen's Fate (+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.