This item drops from Urok Doomhowl, a summonable ogre in the Lower Blackrock Spire.
This item can be joined with the [Bottom Half of Advanced Armorsmithing: Volume III] to form a book called [Enchanted Thorium Platemail] which can be turned in Lorekeeper Lydros in the library in Dire Maul in order to get [Plans: Enchanted Thorium Helm].
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