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D and D has an odd rule which allows any
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number of creatures to exist in the same
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space as long as all but one of them are
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either prone or tiny. The rules for
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movement state that you can end your
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movement in the space of another
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creature, but you have to fall prone
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when you do so. So, a creature is in a
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space, you walk into their space, and if
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you end your movement there, you fall
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prone automatically. This doesn't apply
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if you or the other creature are tiny.
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So, let let's assume that there's a
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human in a space. You walk into their
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space, you fall prone. Somebody else
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walks in their space, falls prone. There
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is no limitation on the number of
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creatures that can do this, which means
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we can have an infinite number of
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creatures fall prone inside the same
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space. Is this useful? Probably not. But
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it's very silly. And it lets us do
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things like uh with circle casting where
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you need some number of secondary
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casters within 30 ft of you. And the
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more secondary casters you have, the
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more powerful second and the more
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secondary casters you have, the more
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powerful your circle casting can be. So
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you want to cram as many creatures as
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possible into the nearby spaces. If you
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built an elaborate scaffolding and like
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made a cube of secondary casters, you
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can fit a pretty insane number of
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creatures already, but pretty insanely
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large is not the same as infinite. So
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get a bunch of level one wizards, have
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them form a dog pile, I guess, and then
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do some circle casting.