Return to Eitrigg at Flame Crest in Burning Steppes.
<You hear a buzzing in your ear.>
<Name>. It sounds like you and Ariok have finished with your tasks. I've also finished mine.
Return to Flame Crest. I've prepared a few packages to deliver to the Big Three: Thorg'izog, Neeralak, and Xi'lun. You've already met General Thorg'izog. This will be your chance to meet the other two.
That is, before you kill them.
You will also receive: 75
Good, you're back.
I hope you've still got that disguise. You're going back undercover, <name>.
Planned correctly, players should have killed the last dragonspawn just outside Flame Crest. If not, oh well. More experience. Either way, head back to Eitrigg to turn in.
On complete, Ariok leaves the player's party and the [Blackrock Disguise] is found. Huzzah! However, should something happen to it, talk to Eitrigg. He has another.
Optional breadcrumbs:  Mouton Flamestar or  Hero's Call: Burning Steppes! or  Warchief's Command: Burning Steppes!
-  Burning Vengeance
-  Stocking Up /  A Future Project /  Mud Hunter
-  The Sand, the Cider, and the Orb
-  Warlocks Have the Neatest Stuff /  Shadow Boxing
-  Return to Keeshan /  Return to Ariok
-  Chiselgrip, the Heart of the Steppes
-  A Needle in a Hellhole
-  Prove Yer Allegiance /  Scrapped Golems
-  Golem Training
-  A Perfect Costume
-  Into the Black Tooth Hovel
-  Grunt Work
-  The Kodocaller's Horn
-  Taking the Horn For Ourselves
-  General Thorg'izog
-  Trial by Magma
-  I Am the Law and I Am the Lash
-  Enough Damage For One Day
-  Morgan's Vigil /  Flame Crest
-  Blackened Ashes /  Latent Demons of the Land /  A Heap of Delicious Worg
-  Blood Tour /  Draconic Vanguard /  A Deal With a Dragon
-  Placing the Pawns
-  A Delivery for Thorg'izog /  A Delivery for Neeralak /  A Delivery for Xi'lun
-  Locked and Loaded
-  Assault on Dreadmaul Rock
-  Glory Amidst Chaos
-  The Spoils of War
Optional breadcrumb to Swamp of Sorrows:  The Bogpaddle Bullet