I mean, wouldn’t the obvious answer without being a tyrant be, to just adjust the followup encounters to still be a challenge? At least in creative ways so as not to just end up with a, “no you” feeling to it or glass cannon vs glass cannon?
I’d prefer to play with a creative DM that would laugh and accept it than one that’ll nerf me for being more creative.
There are several ways to nerf this, if considered too powerful. But I like to reward my players for creative ideas like that. And it’s not really powerful either. You shoot non-magical cannonballs. That’s OK.
I feel like the “monkeys paw” way to interpret this if it’s considered too powerful, is to say that, when the cannonballs grow back to normal size, they keep the same momentum they had when small, and since their mass has increased, that must mean their velocity drops proportionally and they just kinda fall to the ground after leaving the barrel
That would be the DM way to handle it. But if you look at how velocity and momentum is played around with so much in things that alter other parts of reality. Take for example when a speedster turns a bullet to fly a different direction.

I usually ask the players something like “if it was this easy, why doesn’t everyone else do it?”. Sometimes they’ll dismantle their own ideas given the prompt.
Or, sometimes I’ll say “are you sure you want NPCs to use this tactic?”
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Unless that flint lock is a breach loader congratulations on your pipe bomb if you can even get the shot in.
Well, since it would need to be accessible for the occasional magical lock that needs picked, it would have to be removable.
So simply add a quick “slip the ring out of its holder and load a shot” step into the reload process and Robert is your mother’s brother.
This is pretty stupid. There’s no easy way to permanently shrink hundreds of cannon balls; so this scenario doesnt make sense.







