Halls of Fate has both Heroic and Epic versions. What version you get depends on whether you are in a single Group or a Raid.
VERY IMPORTANT NOTE If you complete Transmogrification, talk to the Droag that spawns after you kill the Doom Lord and he will call any named you haven't killed to him, who then drop -A Treasure Chest- on the ground, which can contain masters!
A discussion page exists which may contain more information