• Heart of Iron
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
• Unique
• Trinket
• +162 Stamina
• Requires Level 80
• Use: Increases dodge rating by 432 for 20 sec.
• Sell Price: 11 39 40
• Cooldown: 2 minutes

Source

This item drops from Ignis the Furnace Master 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