• Crown of the Twilight Queen
• Heroic
• Item Level 379Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Cloth
• Head
• 1136 Armor
• +617 Stamina
  +351 Intellect
• Meta Socket
  Blue Socket
• Socket Bonus: +30 Intellect
• Durability 100 / 100
• Requires Level 85
• Equip: Increases critical strike rating by 264.
  Equip: Increases haste rating by 244.
• 
• Sell Price: 10 92 73

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