I've ordered a few items into that shady book seller in Hogsmeade. The old git is charging a pretty galleon for them, but he didn't want names so I guess that is why.
One is a muggle book on demons, it's probably wand rot but it was written by the same man who wrote the Malleus Maleficarum and he got some things right, so perhaps there might be something of use in it.

I have to pick them up on the next Hogsmeade weekend, but it seemed a better idea than having them owled to the school.

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Behold the Awesome of Stefanie!