Hello,
Ever since I got my Gravity Ballista, I realized that we have very limited ways of acquiring both Rune and Dragon Javelins. As far as I know, only Demonic Gorillas and Vorkath can give us Rune and Dragon Javelins. The addition of making these javelins would greatly benefit those who want to use the weapon, especially if it is suppose to rival the Scorpia Blowpipe, but it can't do that if we do not have a reliable way of getting ammo.
Hopefully we can see this be added in the future.