Whispers in the Dark (quest)

Objectives
Find the source of N'Zoth's whispers in the Chamber of Heart.
 * N'Zoth's whispers found
 * Chamber of Heart defended

Description
Did ye hear that as well? That cannae be good.

If N'Zoth gains access tae this chamber, we'll all be done for!

We need tae figure out where he's accessing the chamber and shut it down, before he does more than just whisper at us!

Rewards
You will receive:
 * 22,300 XP
 * +500 reputation with Champions of Azeroth
 * +500 reputation with Champions of Azeroth

Completion
What have we done?

If it weren't for Ra-den's sacrifice, N'Zoth would've had the chamber, and Azeroth would've been his for the takin'.