• Liar's Tongue
• Item Level 232Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Sword
• One-Hand
  
• Speed 1.50
• 187 - 349 Damage
• (178.7 damage per second)
• +52 Agility
  +42 Stamina
• Durability 105 / 105
• Requires Level 80
• Equip: Improves critical strike rating by 34.
  Equip: Increases your expertise rating by 34.
  Equip: Increases attack power by 77.
• 
• Sell Price: 22 26 77

Source

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

Patch changes

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

External links

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