• Golemheart Longbow
• Item Level 219Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Bow
• Ranged
  
• Speed 2.90
• 299 - 556 Damage
• (147.4 damage per second)
• +33 Agility
  +39 Stamina
• Durability 90 / 90
• Requires Level 80
• Equip: Improves critical strike rating by 17.
  Equip: Improves haste rating by 22.
  Equip: Increases attack power by 46.
• 
• Sell Price: 16 69 56

Source

This item drops from trash mobs 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