The pattern is learned from the elemental leatherworking trainer, Sarah Tanner, located at Camp Tanner in the Searing Gorge.
Notes
The 5 minute cooldown of the fireball makes that feature more of a novelty than anything else; however, even without the fireball, this is a very nice helm for its level.
Patch changes
Patch 2.4.2 (2008-05-13): Has had its casting range reduced.
Patch 1.4.0 (2005-05-05): Requirements to make the Helm of Fire were reduced.