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“I smell their cauldrons from here, but that’s not plague they’re cooking. Pledges to the cult are forced to drink a concoction that steals their will and enslaves them forever to the Lich King.Some say the potion contains the twisted soul of a being who was tormented before being mercilessly slaughtered, but I’ve never been able to reproduce it…
Fill this flask with a sample from each of the three cauldrons in the northwest region of the gate and bring it to Chief Engineer Boltwrench.”
-Thassarian
Thassarian aboard the Skybreaker wants you to use the Partitioned Flask at each of the 3 Cultists’ Cauldrons at Aldur’thar, then bring it to Chief Engineer Boltwrench.

You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain:
Quest Giver: Thassarian (Alliance, aboard The Skybreaker)/Koltira Deathweaver (Horde, aboard Orgrim’s Hammer)
Turn In: Chief Engineer Boltwrench (Alliance, aboard The Skybreaker)/Chief Engineer Copperclaw (Horde, aboard Orgrim’s Hammer)
Objective: Use the Partitioned Flask at each of the 3 Cultists’ Cauldrons in the northwest area of Aldur’thar to collect a Blue Sample, Green Sample, and Dark Sample, then deliver the flask to the Chief Engineer.
Quick Facts
Walkthrough
Efficiency Tips
Lore & Secrets
QA Bug Tracker Easter Egg
Part of the QA-themed quest cluster from Thassarian/Koltira. “Cannot Reproduce” refers to a QA tester’s inability to replicate a reported bug after a new build. The quest name doubles as an in-world joke: Thassarian/Koltira has been unable to reproduce the Cult’s will-stealing concoction, hence needing samples.
The quest text leans into this about potions containing “the twisted soul of a being who was tormented before being mercilessly slaughtered.”
Cool Hand Luke Reference
Explore Icecrown’s hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Icecrown Chronicles, along with the complete quest storyline.
Vikstone's War Journal“I smell their cauldrons from here, but that’s not plague they’re cooking,” Thassarian said.

He can smell them from the deck of a gunship. I take that on faith and would rather not know how.
“Pledges to the cult are forced to drink a concoction that steals their will and enslaves them forever to the Lich King. Some say the potion contains the twisted soul of a being who was tormented before being mercilessly slaughtered, but I’ve never been able to reproduce it…”
Pledges. They walk in. Nobody drags them to that cauldron. Whatever the Cult offers a man, he comes and takes the cup himself, and after that he does not get to want anything again.
The flask has three chambers and the cauldrons in the northwest do not hold the same thing. One draws blue. One green. The third came up dark and did not move much in the glass. The cultists tending them objected and I put them down, and by then I had stopped wondering which of the three they had drunk.
Boltwrench poured the contents into a machine he calls a tetrahydroparticle analyzer.
“What we have here is a simple failure to conglomerate…”
Somewhere in the northwest of that gate a man is standing over a fire getting a recipe wrong. He will keep at it. So, apparently, has Thassarian.
Boltwrench got the samples into his analyzer and produced a failure rather than an answer, which in the language of the people who named these quests means the report goes back to the tester with two words attached, Retest Now.