Just because children are young, doesn't mean they don't have pasts they would like to change. Perhaps some young soul wished to make sure his or her sibling took the blame for spilling grape juice on the couch. Much less worthy causes have been championed in the Gungeon.
The Dart Gun is a gun that fires darts. The Cultist starts with this gun.
Notes
Darts will not stick to secret walls, effectively allowing secret rooms to be found.