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Hammer deals in large-scale smithing work. 

Seige weaponry, cannons, black powder, trebuchets, as well as gearworks and the like.  He's got a reputation in the Flames for working with anything that might blow up a wall...or a platoon.  He might be helpful.  Considering that Ishgarde seems to be the Prime place for guns, black powder weaponry, and the mechanical class, Hammer's understanding of gunpowder, lead-throwers, and gears, combined with not being ishgardian even in a good light, might cause her some concern though.