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Alicorn comments on Harry Potter and the Methods of Rationality discussion thread, part 20, chapter 90 - Less Wrong Discussion
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This has only just occurred to me, but if the sole threat to the students was (as far as everyone knew) an ordinary troll, and it was daylight outside, and they were already in the Great Hall, then why didn't the professors just lead the students out of Hogwarts and into the sunny open before assuming defensive formation? It would also have the advantage of giving a group of casters long range on a melee attacker.
For that matter, I wonder if the sky illusion on the Great Hall ceiling counts? It reflects real weather.
Interestingly, the Potterverse is high on mind-affecting spells, but very low on illusions. Assuming illusions are not more difficult to cast than other spells, if artificial daylight holds all the magical properties of normal daylight, vampires and trolls should be virtually (or actually) extinct, since every wizard irrespective of combat training would need only create the illusion of a miniature sun (and presumably close their eyes or look away) to instantly obliterate/incapacitate any such creatures in a fairly large area.
There's probably something magical about direct sunlight.