• Leggings of the Bloodless Knight
• Item Level 200Disenchants into:
  [Abyss Crystal]: 1
• Binds when picked up
  
• Mail
• Legs
• 1097 Armor
• +76 Stamina
  +57 Intellect
• Yellow Socket
• Socket Bonus: +4 Critical Strike Rating
• Durability 105 / 105
• Requires Level 80
• Equip: Improves critical strike rating by 56.
  Equip: Equip: Improves haste rating by 54.
  Equip: Increases spell power by 105.
• 
• Sell Price: 12 34

Source

This item drops from the Black Knight on normal mode.

Patch changes

• Patch 3.2.0 (04-Aug-2009): Added. 
  

External links

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