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“The Forsaken are up to no good and from what I can tell, those plague tanks of sludge are a big part of it. If I may suggest, sir, we should probably destroy them before they can get any more use out of the things. I took the liberty of preparing a bundle of torches from the Ember Clutch. These things have been burning for days!
Here, I’m sure you can put them to better use than I in destroying those tanks.”
-Scout Knowles
Scout Knowles at the Ember Spear Tower has recommended that you use the Ever-burning Torches to destroy the four Plague Tanks surrounding Halgrind.
Provided item:

You will be able to choose one of these rewards:
Upon completion of this quest you will gain:
Quest Giver: Scout Knowles at Ember Spear Tower
Objective: Use the Ever-burning Torches to destroy the four Plague Tanks surrounding Halgrind.
Quick Facts
Walkthrough
Plague Tank Locations
Tips
Efficient Route
Starting from Ember Spear Tower:
This creates a rough clockwise loop around Halgrind without backtracking.
Story Context
Scout Knowles explains what he’s observed:
“The Forsaken are up to no good and from what I can tell, those plague tanks of sludge are a big part of it. If I may suggest, sir, we should probably destroy them before they can get any more use out of the things.”
He hands you torches made from the eternally burning branches of Ember Clutch: “I took the liberty of preparing a bundle of torches from the Ember Clutch. These things have been burning for days!”
When you return, Knowles reacts to what you’ve discovered:
“Nice! But what’s this about the stuff you found inside those tanks? Are you saying that the Forsaken are spraying a plague upon the vrykul down there?”
Lore: The New Plague Testing Ground
Halgrind is a vrykul village that the Royal Apothecary Society has turned into a testing ground for their New Plague. The Forsaken from New Agamand are spraying aerosol plague over the vrykul population, trapping them inside and slowly killing them.
This is one of several testing sites in Howling Fjord. The land around New Agamand is visibly dead and brown compared to the surrounding verdant landscape, the result of plague saturation.
Cross-Expansion Connection: The Wrathgate
What you’re witnessing here is early development of the plague that will be deployed at the Battle of Angrathar the Wrathgate, one of WotLK’s most pivotal story moments. Grand Apothecary Putress, working with the dreadlord Varimathras, will betray both factions by launching this plague against Alliance, Horde, and Scourge forces alike.
The Halgrind quests demonstrate that the plague was being tested on living subjects long before Wrathgate. When you later experience the Wrathgate cinematic and see Bolvar Fordragon engulfed in green fire, remember that you saw this weapon in development right here.
Interestingly, Alliance players will accidentally help perfect the plague in a later Westguard quest. Peppy Wrongnozzle, a drunken gnome alchemist trying to create a vaccine, gives you an “antidote” to test on a vrykul prisoner. The prisoner melts into a pile of goo. Peppy’s drunken response: “Huh? Well that sucks! Darn, I made thingsh worsh. In fact, I think I perfected their plague for them …hic!”
Explore Howling Fjord’s hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Howling Fjord Chronicles, along with the complete quest storyline.
Vikstone's War Journal“The Forsaken are up to no good, and from what I can tell, those plague tanks of sludge are a big part of it.” Knowles pointed toward the village below. Four metallic containers ringed Halgrind, positioned at cardinal points. “If I may suggest, sir, we should probably destroy them before they can get any more use out of the things.”

He handed me a bundle of torches.
“I took the liberty of preparing these from the Ember Clutch. These things have been burning for days! Here, I’m sure you can put them to better use than I.”
Fire from the proto-drake forest, repurposed.
Each tank required fighting through the Plaguebringers guarding it. Their shadow bolts hit hard at range. The torches caught instantly on the metal containers, flames spreading across the slick surfaces, causing each tank to go up in a column of oily black smoke.
“Nice!” Knowles called when I climbed back to the tower. “But what’s this about the stuff you found inside those tanks? Are you saying that the Forsaken are spraying a plague upon the vrykul down there?”
The Forsaken, plaguing the vrykul. It was our enemies attacking our enemies, and somehow that didn’t feel like good news.
Knowles said the Forsaken had left a package somewhere in the village that might explain what the Royal Apothecary Society was actually building toward, which makes Mission: Package Retrieval the one that matters.