Snape was wrong when he suggested that the Marauder’s Map is “plainly full of Dark Magic,” but it really is a remarkably powerful artifact and it's not at all obvious how it works.
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Time travel in Prisoner of Azkaban is a model of consistency, illustrating wonderfully how time travel works—if it’s possible at all.
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The truth of the Ronbledore Theory has by now been pretty well established, but I would like to shore up its foundations with some new evidence, evidence that will help explain why Ronbledore went back in time, as well as—roughly—when.
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Unplottability works not by saying anything about what I can or can’t draw on a map, or by preventing maps from transmitting information, but rather by preventing us from inferring the location of an Unplottable place.
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Much has been made about “the Trace”, the charm on underage witches and wizards that is used by the Ministry to detect illegal spellwork. The problem is that there is no such thing.
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To figure out whose wand is whose and what really happened, let's catalog every instance of disarming ever!
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