Drag and Drop

First, you need kill Bitter Initiate to obtain Orb of Illusion. Then just throw orbs at Dark Subjugator.
Bitter Initiates and Dark Subjugators are in camp at 53, 45 as Elevenstabz said.

THE SKYBREAKER Quest Tree From Whiterock

The Crusaders' Pinnacle*                      1)Preparations for War
 |->Orgrim's Hammer(H)* The Shadow Vault*
 |                        |
1)The Skybreaker------->Exploiting an Opening*
 |__________________________________________
 |                 |->2)Mind Tricks        |->D)Blood of the Chosen
3)The Broken Front |->D)Slaves to Saronite |->2)Joining the Assault
 |   +3)Finish Me! |->2)Get to Ymirheim!       |->D)Assault by Air
 |->D)No Mercy!       D)King of the Mountain   |->D)Assault by Ground
 |
 |--------------------------->1)Your Attention, Please
1)...All the Help We Can Get. 3)Borrowed Technology-->D)The Solution Solution
3)Poke and Prod               5)Killohertz
 |_________________________   6)Leading the Charge
 |                        |    |->D)Static Shock Troops: the Bombardment
3)That's Abominable!      |    |->D)Putting the Hertz: The Valley of Lost Hope
 |->D)That's Abominable!  |
 |                       4)Against the Giants
5)Sneak Preview           |->4)Coprous the Defiled
 |->5)Chain of Command    |->4)Basic Chemistry-->D)Neutralizing the Plague
 |->5)Cannot Reproduce
 |  5)Retest Now-->D)Retest Now
 |
5)Drag and Drop-->D)Drag and Drop
 |->5)Not a Bug-->D)Not a Bug
 |
5)Need More Info------------>5)No Rest For The Wicked
 |                            |->D)No Rest For The Wicked
 |                            |
7)Raise the Barricades------>8)The Ironwall Rampart 
 |->8)Get the Message         |
 |  D)Capture More Dispatches |
 |                            |
8)Bloodspattered Banners      |
 |____________________________|  
 |
9)Before the Gate of Horror
 |                   \
9)Shatter the Shards 9)The Guardians of Corp'rethar

Watts My Target(doesn't work/exist)
Quest Zones:
1)Scybreaker_____2)Ymirheim_____3)Broken Front_____4)Mord'Rethar_____5)Aldur'thar_____6)The Bombardment_____7)Valley of Lost Hope_____8)Valley of Fallen Heroes_____9)Corp'rethar
D)Daily
*Click to see more info about that quest-line.
The Icecrown is done! Leave your comments/sugestions at my comment in Icecrown zone. Thanks everyone who helped me to make it via comments on wowhead and in-game pre-quest tracking.

It's a simple enough quest, and the drop rate isn't too bad. However, avoiding aggro can be a pain, which is annoying since you have to be out of combat to use the orbs. Most of the tents will have Bitter Initiates in them, but because they stand at the back, they're easy to overlook. That is until they start blasting you with Shadowbolts through the tent walls as you venture too close.

Edit: As of 3.0.8 the bitter initiates will usually open with a melee attack before they start spamming you with Shadowbolts. It makes them a little easier to deal with.