• Tyrannical Beheader
• Item Level 232Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Axe
• Two-Hand
  
• Speed 3.50
• 651 - 977 Damage
• (232.6 damage per second)
• +129 Strength
  +137 Stamina
• Yellow Socket
• Socket Bonus: +4 Strength
• Durability 120 / 120
• Requires Level 80
• Equip: Improves haste rating by 92.
  Equip: Increases your armor penetration rating by 53.
• 
• Sell Price: 28 35 95

This seems to be the preffered weapon for Melee DPS and some Death Knight Tanks due to it being relatively easy to obtain and possibly the best Two-handed weapon available as a drop from a 5-man instance boss.

Source

This item drops from Scourgelord Tyrannus in Pit of Saron on heroic mode.

Patch changes

• Patch 3.3.0 (08-Dec-2009): Added. 
  

External links

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