• Leggings of the Tortured Earth
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Mail
• Legs
• 1150 Armor
• +99 Stamina
  +81 Intellect
• Durability 105 / 105
• Requires Level 80
• Equip: Improves haste rating by 75.
  Equip: Increases spell power by 133.
  Equip: Increases your mana regen by 30.
• 
• Sell Price: 13 7 24

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