i think it wold be a demolition job that wold need flint and steal to be promoted a job that wold add a lot to mining and/or military businesses (although it dose not need to be a new job these ideas can be added to the (relatively dull) engineers builds)
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one of my ideas was a “gift” that you can give to the goblins in addition to what thy asked for that wold blow up and get rid of the entire camp
so with flint and steel you mean explosives? bombs and dynamite? could be fun 
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a different idea is a mining bomb that you set of in a cave or tunnel and it will leave all the resources that you wold of got if you mind the same size of a pit but this way it dosnt take as much time 
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