Quest:The Four Dukes

Objectives
Find a way to summon and slay the Duke of Cynders, the Duke of Fathoms, the Duke of Zephyrs and the Duke of Shards and report back to Commander Mar'alith in Cenarion Hold. You must also bring Tactical Task Briefing V in order to complete this quest.
 * The Duke of Cynders slain
 * The Duke of Fathoms slain
 * The Duke of Zephyrs slain
 * The Duke of Shards slain
 * Tactical Task Briefing V

Description
The links between the Twilight's Hammer and the Abyssal Council are proving to be more important than we had expected.

We believe the elemental nobles known as the Abyssal Dukes are one of the primary force organizing the Twilight's Hammer cultists. Find a way to lure the four Abyssal Dukes into our plane of existence and destroy them!

Your dedication and prowess in past assignments have led us to choose you for this particular assignment. We are certain you will succeed in this endeavor.

Progress
Is your task done yet, ?

Completion
You have achieved a great accomplishment for our cause today,. You've vanquished some of our most powerful enemies. For that I greatly commend you.

Reward
You will be rewarded with all of the following:
 * Mark of Cenarius

Gains
Upon completion of this quest you will gain:
 * +250 Cenarion Circle reputation