I've added a couple new arrow types to the game: Bone and Fire.
Bone arrows travel slightly slower and do less damage, but are way, way, waaay easier to hit people with. Their bounding box is 3x that of a regular arrow. These are a default blueprint.
Fire arrows are a bit of a disaster right now, so please understand that this implementation is a 'first pass'. The visual effects are kind of crappy, and they don't work exactly how I wanted them to. You were supposed to have to dip the drawn arrow into a lit campfire to ignite it, but due to a bunch of issues this wasn't possible. For now they're always just magically lit. They too are a bit easier to hit targets with, and deal 20 fire splash damage in a 2m radius of their impact point. They also do damage to wooden doors and deployables, so you can technically use them to raid. You'll have to find these in the world and research them.
Expect some changes in the next patch, where the arrows need to be lit by another player's torch or a campfire, and they'll hopefully have better particle effects.