Bullet
What's more simple than a bow? A bullet. Bullets just have to be shot out of a gun and somebody dies. Bows you have to load with an arrow and pull it back and aim, yuck. Bullets are the new bows, people.
Imagine how simple life would be if we replaced all the bows in the world with bullets. (Insert sarcastic crying face here.)
だん
ひ, はず, たま
None
If you want to shoot bullets, you need to do it at dawn (だん). Back in the old days, it wasn't bright enough to shoot arrows at dawn, but you can shoot bullets at dawn because they're simpler to use!
Imagine shooting bullets into the sun at dawn. Pow pow, take that history! Blam blam, take that dawn!