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Message: <blockquote data-quote="Greenfield" data-source="post: 7235605" data-attributes="member: 6669384">I see a problem with the Grape Shot approach:  The command to re-enlarge an item is a standard action.  I don't know how you would do that to more than one item in a round.The other way would be to time a Dispel Magic for mid flight, and considering the actual damage listed for catapault stones, you'd probably do better by spending that 3rd level slot on a Fireball.The "conservation of momentum" idea you mention is, if I recall, one I addressed on my very first post to this forum.  The result was the infamous "Hamster cannon" maneuver, which is based on the fact that the world is spinning on its axis and orbiting a star (as required in a physics based model where CoM would apply).  Simply put, if you Shrink Item on a "stationary" object, say a couple of tons of iron (well within volume range), you have to increase it's velocity by the same 4096-to-1 that you reduced it's mass.  Your 1 lb chunk of iron goes from "stationary" on the planet's surface to 4096 x (rotation speed (about 1000 mph) + orbital speed (approx 62,500 mph)).  Exact speed and vector will vary, depending on the time of day.  At midnight, in a temperate zone, on or about the equinox (average orbital speed) giving a speed of 260,096,000 mph, give or take a few.  In short, your iron cannonball is moving at about 1/6th the speed of light, and will devastate anything in it's path.  The shock wave will probably suck you, the caster, along for a likely fatal trip through it's jetstream, while tearing away a sizeable chunk of the planetary atmosphere.My original example used Polymorph on a donkey loaded with rocks, into a hampster.  That's an 8000-to-1 change in mass, so double the approximate speed while quartering the mass.So yes, you too can destroy the world with a 3rd or 4th level spell.  All you have to do is try to apply physics to a situation that can't occur in physics:  An object spontaneously gaining or losing mass.  <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" /></blockquote>

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