etc // happy bunny // hostage by plot bu

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Writing a story where an emissary from a more advanced civilization has arrived to give weapons to a a civilization that has only recently graduated to crossbows so that they can defeat their enemies. I'm just not sure what the technology IS. Should I go with the obvious and have it be gunpowder/firearms? Something a little more techy that these people will still be able to figure out, repair and perhaps replicate? Or just go with something that's essentially magic? I don't know anything about my advanced civilization yet so the possibilities are pretty wide open.
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What about something like pepper spray or a tazer? not a lethal weapon but something that was could have been seen as magic by people in the 1800's?

especially if the ingredients for the pepper spray are found only on the one person's homeland...making him and his people the sole source.