I've just spent a fair bit of time catching up some Kobold Camp threads. I felt sympathy for the critters, but now even more so.
Anyway, thought I'd contribute an idea since earlier I read some people talking about making a "bow" object that would be used to hurl throwing axes, and I had a bit of an inspiration:
Atlatl. It's a stick shaped and used to increase the throwing distance and power for spears. It might be appropriate to call the thrown spears "javelins" to distinguish them from melee spears.
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For my own contribution to how I'm starting to think about kobolds and the DF world:
I kind of get the feel that dwarves have gone the way of technology, believing themselves to be superior, entitled beings in control of nature. When a dwarven fortress is in trouble, they solve it with their superior technology and machismo. One of the biggest dangers to a dwarf fortress comes in the form of performing overblown hazardous operations just to prove that they can do it.
Kobolds are the opposite of dwarves, being at the mercy of the world. They have to scrape for every tiny thing they can get their hands on. They are looked down upon by the more advanced races and have learned humility as a result. Because they know that they're small and weak, they're more likely to plead with the gods/spirits/whatever for help. That's where one idea of mine comes comes in: A magic altar "workshop" to the kobold gods: They sacrifice some kind of material (possibly live animals) to gain some form of gift from those gods in the form of resources they normally have a hard time accessing.
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Putting aside making something custom, one entertaining thought I had closer in the KC mainstream was a camp somehow getting an anvil, making a raised "altar" for the workshop, placing some metal bars they traded for at the base, and praying for the gods to touch one of their kind with inspiration (strange mood) so that they may unlock the secret magic of the bearded ones and achieve some modest measure of prosperity.