• Robes of the Umbral Brute
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Cloth
• Chest
• 314 Armor
• +85 Stamina
  +86 Intellect
• Blue Socket
• Socket Bonus: +5 Spell Power
• Durability 100 / 100
• Requires Level 80
• Equip: Improves critical strike rating by 58.
  Equip: Improves haste rating by 82.
  Equip: Increases spell power by 123.
• 
• Sell Price: 9 17 11

Source

This item can be found inside Cache of Living Stone after defeating Kologarn in the 25-man version of Ulduar.

Patch changes

• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB