• Spire of Withering Dreams
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Staff
• Two-Hand
  
• Speed 2.80
• 475 - 713 Damage
• (212.1 damage per second)
• +73 Agility
  +93 Stamina
• Durability 120 / 120
• Requires Level 80
• Equip: Improves haste rating by 76.
  Equip: Increases attack power by 212.
  Equip: Increases your armor penetration rating by 67.
• 
• Sell Price: 26 93 39

Source

This item can be found inside Cache of Living Stone after defeating Kologarn in the 10-man version of Ulduar.

Patch changes

• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

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