• Staff of Endless Winter
• Item Level 239Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Staff
• Two-Hand
  
• Speed 2.10
• 244 - 451 Damage
• (165.3 damage per second)
• +111 Stamina
  +128 Intellect
  +84 Spirit
• Blue Socket
  Blue Socket
• Socket Bonus: +9 Spell Power
• Durability 120 / 120
• Requires Level 80
• Equip: Improves critical strike rating by 104.
  Equip: Increases spell power by 587.
• 
• Sell Price: 30 12 96

Source

This item can be found inside Rare Cache of Winter after defeating Hodir on hard mode 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