• Serilas, Blood Blade of Invar One-Arm
• Item Level 232Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Sword
• One-Hand
  
• Speed 2.60
• 325 - 605 Damage
• (178.8 damage per second)
• +52 Agility
  +34 Stamina
• Yellow Socket
• Socket Bonus: +4 Critical Strike Rating
• Durability 105 / 105
• Requires Level 80
• Equip: Improves hit rating by 32.
  Equip: Increases your expertise rating by 26.
  Equip: Increases attack power by 72.
• "Countless notches cover the blade's length."
• 
• Sell Price: 23 25 87

Source

This item drops from Freya on hard mode in the 10-man version of Ulduar. Invar One-Arm, a hero of the Scarlet Crusade, lost it in Northrend.

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