• Boots of Az'galada
• Heroic
• Item Level 379Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Mail
• Feet
• 1796 Armor
• +458 Stamina
  +266 Intellect
  +174 Spirit
• Yellow Socket
  Red Socket
• Socket Bonus: +20 Intellect
• Durability 75 / 75
• Requires Level 85
• Equip: Increases mastery rating by 194.
• 
• Sell Price: 16 34 44

Source

This item drops from Sinestra in the Bastion of Twilight raid instance on heroic mode.

Patches and hotfixes

• Patch 4.0.3a (2010-11-23): Added. 
  

External links

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