The Frozen Earth

Objectives
Element-Tamer Dagoda at Zim'Torga wants you to collect 7 Essence of the Frozen Earth.
 * Essence of the Frozen Earth: (7)

Description
We captured these elementals from nearby, and I have plenty of defenders now. But, it takes a great deal of power to make them strong enough to stand up to our enemies.

The frozen earth at Drak'Mabwa to the northwest have what I need to maintain our defenses. I'll need more of their essence if I'm to keep this up.

Rewards
You will also receive:

Progress
I hope that you've returned with enough. The attacks from the Pools of Jin'Alai have become more desperate after what you did to them.

Completion
Thank you,. Those essences should be enough to fuel my casting for quite some time.