Be careful when wearing this, you may be mistaken for a member of the Twilight's Hammer cult and painfully slaughtered by questing heroes.
I love how sinister this looks, however there is bad news for anyone who is Alliance and not a Warlock, you will be unable to get the horns. There is a Horde quest in Nagrand for the head, the warlock level 50 quests or the Felheart Horns that drop from Molten Core.
Stormspire Vest
Leggings of the Icy Heart
Ironweave Mantle
Netherweave Gloves
Mag'hari Ritualist's Horns
Stone-Worn Footwraps
Shroud of the Highborne
Cauterized Cord
Charmed Cierge