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“This should do the trick! Those twisted hooligans are looking for souls to put in their crazy-juice? Then I say we help ’em out a bit! Take a swig of this – don’t worry, I’ve diluted it plenty… I’m almost positive that its only effect will be to detect any cultist’s essence once you’ve defeated them.
When you’ve collected a bunch of them, throw the writhing mass of twisted souls into any of their cauldrons. Let’s see how they like a taste of their own medicine!”
-Chief Engineer Boltwrench
Chief Engineer Boltwrench aboard the Skybreaker wants you to throw a Writhing Mass into a cauldron at Aldur’thar.
Provided item:

You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain:
Quest Giver: Chief Engineer Boltwrench (Alliance, aboard The Skybreaker)/Chief Engineer Copperclaw (Horde, aboard Orgrim’s Hammer)
Objective: Drink the Diluted Cult Tonic, collect 10 Tainted Essences from cultists at Aldur’thar, combine them into a Writhing Mass, and throw it into one of the three cauldrons.
Quick Facts
Walkthrough
Step 1: Drink the Tonic
Step 2: Kill Cultists for Tainted Essences
Step 3: Create the Writhing Mass
Step 4: Choose Your Cauldron
| Cauldron | Buff |
|---|---|
| Blue/Grey Cauldron | +100 Attack Power |
| Green Cauldron | +100 Stamina |
| Dark Cauldron | +100 Spell Power |
Step 5: Turn In
Bonus Buff Trick
Efficiency Tips
Lore & Secrets
QA Bug Tracker Easter Egg
Part of the QA-themed quest cluster. “Retest Now” is the status used in bug tracking when a developer’s fix is ready for the tester to verify. In context, the Chief Engineer has analyzed the cauldron samples from Cannot Reproduce and developed a countermeasure (the Diluted Cult Tonic). Now it is time to “retest” by sabotaging the Cult’s cauldrons with their own corrupted essences.
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“This should do the trick! Those twisted hooligans are looking for souls to put in their crazy-juice? Then I say we help ’em out a bit! Take a swig of this. Don’t worry, I’ve diluted it plenty… I’m almost positive that its only effect will be to detect any cultist’s essence once you’ve defeated them.”

Almost positive.
I drank it standing on the deck without putting the vial down first.
The pledges walk to their cauldron of their own accord as well.
It tastes the way it smells. Afterward every cultist in Aldur’thar had a shimmer on them, and when one went down the shimmer came off the body and hung there waiting to be picked up.
Ten of them go in one flask and they do not settle. They work against each other in the glass the whole way, and I carried that across the gate with my hand around it.
“Well, warrior? We have a few less cultists to worry about?” Boltwrench’s voice, cheerful, while I was still down there holding it.
I threw it into the nearest cauldron and it went in and the cauldron did not survive it.
“Wahoo! That’ll teach ’em!”
An army still had to walk up that road under fire, which is why the next order was about cover rather than sabotage, Raise the Barricades.