Black Grasp of the Destroyer

Black Grasp of the Destroyer is mail hand armor with strong anti-magical properties. For every successful melee or ranged attack, you gain 8 mana and your target loses 8 mana.

Source
Black Grasp of the Destroyer is crafted by Blacksmiths with a skill level of 300.

The components are:
 * 8 Large Obsidian Shards
 * 24 Small Obsidian Shards
 * 8 Enchanted Leather
 * 1 Flask of Supreme Power

The plans drop off Moam in the Ruins of Ahn'Qiraj.