My Noob Notebook: Hidden Artifact: Unholy DK

The Hidden artifact weapon for the Unholy DK is The Bonereaper's Hook and it the hardest to get for the DK due to the randomness of the spawn of the ghoul. First you need at least Artifact Knowledge level 6 and then any time you summon Army of the Dead using Apocalypse you have a chance to spawn a special ghoul (an Orc) which will drop Professor Putricide's Lost Journal. This journal will tell you to go to Professor Putricide's Secret Lab which is located in ICC. When you arrive there you will find a portal on the floor, below the green bubble on the right, called Trap Door. There is no need to kill Professor Putricide just go through the Trap Door.

The Trap Door will take you to a secret room where you will find Stitchwork.

Go down the ramp in front of you and follow the path to get to him. Kill him to loot the Bonereaper's Hook

"Fed by the steady settling energy of Icecrown Citadel, this crude and brutal weapon could easily be fashioned into an instrument of death."

It is possible to spawn the special ghoul and not realise while fighting, as it can happen at any time. Many people have used the target dummies and proving grounds in order to try and proc Apocalypse as often as possible to spawn the ghoul. Do not worry if you spawn the ghoul and don't realise and forget to loot the journal, it is not needed for the Trap Door to become available, just spawning the ghoul will mean the Trap Door will be there next time you visit ICC. For me I spawned the ghoul while attempting the Mage Tower scenario and I was unable to loot the journal, but the Trap Door had spawned.

There is a script you can use to see if you have completed this and spawned the ghoul. This script will return a result of false if you have not spawned the ghoul and true if you have spawned the ghoul, then just go get your new weapon.

/scriptprint(IsQuestFlaggedCompleted(44188))

The first weapon you get is coloured purple. You can unlock three other colours of the Bonereaver's Hook.