Tenes que hacer 2 raids TBC:

Gloves - Leotheras the Blind http://www.wowhead.com/?npc=21215 - Serpentshrine Cavern
Leggings - Fathom-Lord Karathress http://www.wowhead.com/?npc=21214 - Serpentshrine Cavern
Helm - Lady Vashj http://www.wowhead.com/?npc=21212 - Serpentshrine Cavern
Shoulder - Void Reaver http://www.wowhead.com/?npc=19516 - The Eye
Chest - Kael'thas - http://www.wowhead.com/?npc=19622 - The Eye

Mas info: http://www.wowhead.com/itemset=666/avatar-regalia