plisnithus8
Adventurer
Regarding the polymorph spell, "The target’s gear melds into the new form."
An enclosing box that would prevent growth is fundamentally no different from a jacket, belt, or pair of boots. It simply melds into your form until the spell ends.
Those are not analogous. We know what happens, rules wise, when a sleeping person is thrown off a cliff. We DON'T know what happens, rules wise, when Polymorph and cramped spaces interact.
The creature's gear melds at casting. That has nothing to do with the box which it is put in later. Polymorph doesn't have a lingering transformation effect; only the gear worn at casting. And as stated before, something the creature is inside is not gear.
Sleep/cliff is similar to polymorph/box. If the character had done polymorph/box before, they should reasonable expect a similar effect again. Similar to rolling a creature off a cliff could be unpredictable if there is a river below, or rocks, ect. Not exactly the same, but seem similar, both have insta-kill options, both have variables, both need something else: cliff or magic box.
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