• Shadowbite
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Dagger
• One-Hand
  
• Speed 1.80
• 235 - 353 Damage
• (163.3 damage per second)
• +45 Agility
  +34 Stamina
• Durability 75 / 75
• Requires Level 80
• Equip: Improves hit rating by 35.
  Equip: Increases attack power by 60.
  Equip: Increases your expertise rating by 31.
• 
• Sell Price: 20 75

Source

This item drops from General Vezax in the 10-man version of Ulduar.

Patch changes

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

External links

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