On the map
Silithus- not on the map
Progress
The Scarab Gong looms ominously before you. Steel yourself, <name>; for once the Scarab Gong is rung, the gates of Ahn'Qiraj will be opened.
From the slackened maw of the beast can only come chaos and destruction. Defend your people!
Completion
From the ground near the gong springs a special crystal. Perhaps favor from the Brood.