• Barbed Ymirheim Choker
• Item Level 232Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Neck
• +67 Agility
  +54 Stamina
• Requires Level 80
• Equip: Improves critical strike rating by 39.
  Equip: Improves haste rating by 48.
  Equip: Increases attack power by 99.
• Sell Price: 7 56 23

Source

This item drops from Forgemaster Garfrost in Pit of Saron on heroic mode.

Patch changes

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

External links

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