From the Entrance of the Zone, clear The Dragon infront of you turn Right and go up till you reach the Raptor Racnar section.
Invis yourself and pass thrue go further up untill you see the 2 Wyvern guarding the Passage way leading into the great room to the Left.
Kill 8 Wyvern and your done !
Fabionar- Halo Guardians -Drinal