Artifact dart Safety Pin. It has no special benefits if used as a dart, but instead has a passive carry effect of protecting all your scrolls in open inventory from burning or wetting.

Artifact dart that has a 100% break rate when thrown, but if it’s carried in main inventory, it will periodically replicate itself and increase its stack size, to a maximum of 50.

Archeologists should have Skilled skill cap in either darts or spears to nod towards Mesoamerican atlatls and other throwing devices.

Dart and arrow traps should shoot a consistent type of dart or arrow (i.e. not shooting a +1 dart and then a +0 silver dart), and if there is a stack of them pregenerated on the trap those should be consistent with it too.

Darts can be dipped in several different potions besides sickness to get different effects. Blindness, hallucination, sleeping, confusion, etc. Implementation-wise, this can be done by overloading the corpsenm flag on ammunition to indicate which potion it’s been dipped in.

Blowguns, a weapon which can be used as a launcher for darts. (Cavemen can thematically use these.)