http://www.mmo-champion.com/threads/...der-EncountersRa-den
Heroic Only - Ra-den is only available on Heroic difficulty.
Shrouded in Mystery - There are no scholars with any recollection or record regarding the details of Ra-den's powers. Perhaps these memories have been obscured by the passage of time, or perhaps none who saw the Keeper of Storms in battle ever lived to speak of what they witnessed....