• Cosmos
• Item Level 239Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Held In Off-hand
• +52 Stamina
  +55 Intellect
• Requires Level 80
• Equip: Improves hit rating by 51.
  Equip: Improves critical strike rating by 41.
  Equip: Increases spell power by 84.
• Sell Price: 7 56 23

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