I removed the projectile created on NPC hit, way too overpowered 
Terraria Community Forums
yudgefudge
Balancing? What's that?
The Storm
I should just increase the damage to 9999 and make it crafted with 64 dirt 
(Don't worry I have nerfed it quite a bit)
(Don't worry I have nerfed it quite a bit)
qwerty3.14
64 dirt seems kind of expensive... might I suggest 63 dirt?
The Stone Launcher MKII, post Plantera, the boulders bounce 3 items and 8~ fragments get shot out each time it bounces, and 2-3 get shot out if it hits an enemy, and it pierces 5 times.