• Relic Hunter's Cord
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Leather
• Waist
• 333 Armor
• +85 Agility
  +84 Stamina
• Durability 40 / 40
• Requires Level 80
• Equip: Improves hit rating by 57.
  Equip: Increases attack power by 120.
  Equip: Increases your armor penetration rating by 49.
• 
• Sell Price: 5 50 74

Source

This item drops from trash mobs in the 25-man version of Ulduar.

Patch changes

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

External links

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