The rules for shapeable spells say that no dimension can be smaller than 10 feet across. What happens if I cast this spell in a 5x100' corridor? Does it not work?
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I would say that the spell would fail as the "shaped effect or area can have no dimension smaller than 10 feet." So if it's not at least that big you'd be wiser to use another spell.
Spell Failure
If you ever try to cast a spell in conditions where the characteristics of the spell cannot be made to conform, the casting fails and the spell is wasted.
--Vrock Slide