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This set comes from Foxfyr of Eitrigg <Victorious Secret>! The Darkmantle pieces can be obtained in the dark moon fair and while time consuming can be obtained solo. The axe drops off Al’ar from Tempest Keep, so bring a friend, while a group of friends will most likely have to help you grab the dagger in 25man Ulduar. Finally, the helm drops off Illidan in the Black Temple, which will also require a couple of friends at least.