• Frostplate Greaves
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Plate
• Legs
• 2054 Armor
• +99 Stamina
  +81 Intellect
• Blue Socket
• Socket Bonus: +5 Spell Power
• Durability 120 / 120
• Requires Level 80
• Equip: Improves critical strike rating by 75.
  Equip: Restores 27 mana per 5 sec.
  Equip: Increases spell power by 124.
• 
• Sell Price: 15 30 51

Source

This item can be found inside Cache of Winter after defeating Hodir 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