• Legplates of the Argent Armistice
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Plate
• Legs
• 2032 Armor
• +98 stamina
  +70 intellect
• Blue Socket
• Socket Bonus: +5 Spell Power
• Durability 120 / 120
• Requires Level 80
• Equip: Improves critical strike rating by 50.
  Equip: Restores 38 mana per 5 sec.
  Equip: Increases spell power by 124.
• 
• Sell Price: 15 8 30

Source

Contained in Eadric's Cache after defeating Eadric the Pure at the Trial of the Champion in heroic mode.

Patches and hotfixes

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

External links

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