The Iron Boot Flask is a reusable item which can be bought from Olut Alegut at the Grom’arsh Crash-Site (Horde) or Rork Sharpchin in Frosthold (Alliance) in the Storm Peaks.
To open up the vendor you will need to complete the prequest: Ancient Relics which requires you to turn in 10x [Relic of Ulduar]. From there, you can purchase the Iron Boot Flask in exchange for another 10x [Relic of Ulduar].
The buff turns you into an Iron dwarf for 10 minutes, does not need to be equipped and has a 1 hour CD.
While in Iron Dwarf form, you have a 10% chance to shoot an Electric Discharge which hits attackers for 100-150 Nature Damage.
If you use the Flask before defeating the Assembly of Iron in Ulduar, you will also get the achievement – But I’m On Your Side.
Things to note
- You cannot mount while shapeshifted.
- Shapeshifting will break the form.