What would it look like if a portal opened to a dimension with drastically less energy?
Imagine the other dimension is much much colder. Very little light/heat/etc. Suppose the portal only allows energy transfer, so matter can't pass through.
What would the consequences be? Would it just be a very dark, cold spot? Would there be strange weather patterns, or would it mostly just sit there?
I'm trying to come up with the most violent scenario possible - a disaster on the scale of volcanic proportions, that would wipe out cities very quickly. Is that even possible given the criteria above?
The "portal" also doesn't need to be a circle or sphere, if that would limit the effect. It could be more of a tear/rip between dimensions, or a mesh of multiple holes over an area, etc.
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