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“The cultists have discovered the last messenger you summoned, Night Elf. While it was quite informative, it’s important that we continue to monitor their every move. Use this rod to siphon the dark matter from the corpses of enslaved minions at Aldur’thar. Then use their summoning crystal to bring another dark messenger into being.
Until it is discovered, the messenger will serve as our eyes and ears, discreetly observing the actions of our enemy.”
-Thassarian
Thassarian, aboard the Skybreaker, wants you to collect 5 Dark Matters and summon a Dark Messenger 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: Thassarian aboard The Skybreaker (Alliance)/Koltira Deathweaver aboard Orgrim’s Hammer (Horde)
Objective: Collect 5 Dark Matters using the Rod of Siphoning on Enslaved Minion corpses, then summon a Dark Messenger at the summoning crystal.
Quick Facts
Walkthrough
Collect Dark Matter
Summon the Dark Messenger
Efficiency Tips
Lore Context
Thassarian is literally planting a “bug” (a spy) inside Aldur’thar, not an insect but a Dark Messenger that will serve as the Ebon Blade’s covert surveillance agent. His opening line leans into the double meaning: “Alright, time to plant a bug. Relax, it’s not a bug exactly, but it’ll serve our purposes.”
The Dark Messenger is created from the dark matter extracted from the Cult of the Damned’s own enslaved demons, then summoned using their own summoning crystal. Like so many Ebon Blade operations, the tactic turns the enemy’s infrastructure against them.
The Messenger discreetly observes Scourge operations and reports back until the cultists eventually discover it, at which point the daily version kicks in to replace it.
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“Alright, friend, time to plant a bug. Relax, it’s not a bug exactly, but it’ll serve our purposes. In the northern portion of Aldur’thar the cult’s void summoners enslave demonic minions. Use this rod to siphon the dark matter from the corpses of these enslaved minions, and then use their summoning crystal to bring our little spy into being. Until it is discovered, the messenger will serve as our eyes and ears, discreetly observing the actions of our enemy.”

The summoners keep to the northeast with their voidwalkers on short leashes. You kill the warlock. Then you kill the thing he had bound, which by then is standing there with nobody holding it. Then the rod, before you touch anything else.
What comes out is dark and slow to leave the body, and the rod takes it whether the corpse is finished with it or not.
The crystal is theirs, at the center of the north end. I did not bring anything to that place. I stood at the cult’s own altar and built a thing out of five of their slaves, and it took shape and went off into the gate to watch them. It will be found, because Thassarian said so while he was handing me the rod.
“You have done well, warrior. The messenger has already turned up some valuable information.”
A spy can watch a gate all day without telling you who gives the orders, which is why the next order came back with a request for something the Ebon Blade could not steal, since Thassarian simply Need More Info.