• Blackened Geist Ribs
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Leather
• Chest
• 585 Armor
• +98 Agility
  +91 Stamina
• Red Socket
• Socket Bonus: +4 Agility
• Durability 120 / 120
• Requires Level 80
• Equip: Improves hit rating by 63.
  Equip: Improves haste rating by 71.
  Equip: Increases attack power by 154.
• 
• Sell Price: 10 97 23

Source

This item can be found inside The Captain's Chest after defeating the Lich King in Halls of Reflection.

Patch changes

• Patch 3.3.0 (08-Dec-2009): Added. 
  

External links

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