Thwart the Dark Conclave

Objectives
Slay the Dark Conclave Ritualists and use the Staff of Parshah to end the Dark Conclave's summoning ritual, then return to Parshah in the Magma Fields.
 * End Dark Conclave Summoning Ritual
 * Staff of Parshah (Provided)

Description
The spirits of the dark conclave seek to summon an ancient and powerful evil through a ritual conducted at the lava pits to the south of the Sketh'lon Base Camp. Gul'dan's magic mingled with their own, empowering them to aid this creature in manifesting in our world! We must not allow this to happen, &lt;name&gt;. The death and destruction it would bring are unimaginable! Carry the staff with you to the site of the summoning and use its magics to stop the dark conclave once and for all!

Reward
You will also receive:

Progress
Is it done, &lt;name&gt;? Have you stopped the dark conclave from completing their ritual?

Completion
I have sought a way to stop the dark conclave for years, and you have succeeded where I failed. The conclave's dark rituals will threaten us no more. I often feel guilty for abandoning my fellows all those years ago, but now I finally know that I made the right decision. If not for my wavering conscience then, I might have ended up as a shade among them.

Gains
Upon completion of this quest you will gain:
 * 15400 XP (or at level 70)

Progression

 * 1) The Sketh'lon Wreckage (Alliance)
 * 2) *The Sketh'lon Wreckage (Horde)
 * 3) Find the Deserter (Alliance)
 * 4) *Find the Deserter (Horde)
 * 5) Asghar's Totem
 * 6) The Rod of Lianthe
 * 7) Sketh'lon Feathers
 * 8) Imbuing the Headpiece
 * 9) Thwart the Dark Conclave

Trivia
The monster they seem to be summoning is a smaller version of C'Thun.