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|Race||Iron giant (Giant)|
|Health||3M (Normal) / 10M (Heroic)|
|Location||The Assembly of Iron|
- Main article: Assembly of Iron
- Hotfix (2009-05-13): "If a pet dies from Overwhelming Power on Steelbreaker in Ulduar, Steelbreaker will gain an Electrical Charge. "
- Hotfix (2009-05-04): "In the Assembly of Iron encounter, the duration of Overwhelming Power has been increased to 30 seconds in heroic mode and the amount of healing that Steelbreaker receives from Electrical Charge (sic) has been reduced to 20% of his max health. "
- Hotfix (2009-04-15): "The effects of Meltdown will no longer be able to be bypassed by using Divine Shield. "