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The first tier of raid content is going live on Tuesday, December 2nd. This includes the World Bosses: Drov the Ruiner, Tarlna the Ageless and Rukhmar; --and the raid: HighmaulGet your Seal of Tempered Fate ready!
Big Red One is planning to raid that first night, if you're interested in joining us check out the thread here.
Blizzard will be unlocking the content on a weekly basis. Below is the schedule: (source)