• Voldrethar, Dark Blade of Oblivion
• Item Level 239Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Sword
• Two-Hand
  
• Speed 3.60
• 704 - 1057 Damage
• (244.6 damage per second)
• +130 Strength
  +145 Stamina
• Red Socket
  Blue Socket
• Socket Bonus: +6 Critical Strike Rating
• Durability 120 / 120
• Requires Level 80
• Equip: Improves critical strike rating by 86.
  Equip: Increases your armor penetration rating by 69.
• Sell Price: 30 1 6

Source

This item drops from General Vezax in 25-man version of Ulduar on Hard Mode.

Patch changes

• Patch 3.1.2 (2009-05-19): Stats changed. 
  
• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

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