Seek the Saboteurs

Objectives
Find Coren Direbrew in the Grim Guzzler within Blackrock Depths.

Description
This scrap of paper seems to have been left behind accidentally by the Dark Iron invaders.

While the plans are complicated and written in some form of coded Dwarvish, the signature at the end - "Coren Direbrew" - is clear enough, as is mention of the Grim Guzzler deep within Blackrock Depths. You should seek out the instigator and put an end to these raids.

Rewards
You will receive:
 * Dark Iron Ale Mug x5
 * 25 reputation with Thorium Brotherhood

Completion
It's a damn shame, it is, you lot cavorting up there without drinking the finest of the fine brews - ours! Did we get an invite to the competition? Of course not. Ya fight in some war and suddenly yer beer's not good enough! So aye, we smashed up yer kegs a bit, and rightly so!

Er... seeing as you've smashed through our defenses and all, though, maybe ya can do something fer me...

Progression

 * Seek the Saboteurs
 * The Best of Brews