A Snake with Three Heads

Objectives
Slay the three naga channelers.
 * slain
 * slain
 * slain
 * Zeth'jir Channeling Rod (provided)

Description
Now that all of the preparation has been done, it's time to tackle the main threat.

You can use the channeling rod you just found in conjunction with this scroll I got from Rikal to break the shields around the naga leaders in the delta.

Hurry! Stop them before they finish their summoning!

Rewards
You will receive:
 * 16,450 XP
 * +75 reputation with Storm's Wake
 * +75 reputation with Storm's Wake

Progress
If they finish their summoning, that wall is done for.

Completion
Well, the bubble seems to be gone, but I don't like the looks of that whirlpool.