Using your [Blackrock Disguise], sneak into the Skull Warren and convince Dragon-Lord Neeralak to take your Crate of Sleeping Flamekin. Speak with Eitrigg if you need a new Blackrock Disguise.
The warlocks of the Blackrock Clan often practice their magic in the Skull Warren, a cave on the eastern side of Dreadmaul Rock. Their leader, Xi'lun, is busy elsewhere, so the cave is currently being held by another of the big three: Dragon-Lord Neeralak. And Neeralak's expertise is in dragons, not necromancy.
I've used the slumber sand on those flamekin you captured. Try to convince Neeralak that they're warlock imps, and not flamekin. When they wake up, they won't be happy.
You will receive: 40
What are these? Oh, are these imps?
I'm pretty sure that imps don't just fall asleep in boxes!
I'll take your word for it, though. I don't understand any of this warlock crap. Leave them in the corner.
Pick up  A Delivery for Thorg'izog and  A Delivery for Xi'lun before heading out. Put on the costume and mount up. The entrance to the Skull Warren is at [70.7, 38.0] on the middle level of the northeast side of Dreadmaul Rock. Enter and keep taking lefts to reach the bottom of the cave system.
- Dragon-Lord Neeralak says: I guess I'll just... leave the sleeping imps right over here? Are these even... imps? Gah!
After completing all three, Eitrigg radios in with  Locked and Loaded.
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