• Sabatons of Lifeless Night
• Item Level 239Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Plate
• Feet
• 1663 Armor
• +93 Strength
  +108 Stamina
• Yellow Socket
  Blue Socket
• Socket Bonus: +4 Strength
• Durability 75 / 75
• Requires Level 80
• Equip: Improves critical strike rating by 64.
  Equip: Improves haste rating by 47.
• 
• Sell Price: 12 13 50

Source

This item can be found inside Gift of the Observer after defeating Algalon the Observer 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