Moste Potente Potions is an illustrated guide to dangerous, high-level potions.
This guide to dangerous, high level potions is kept in the Restricted Section of the Hogwarts Library and is discussed (though not intended to be used) in second-year Potions (CS9). It contains (among other things) the instructions for making Polyjuice Potion. Hermione managed to obtain access to the Restricted Section in order to check out this book, and used it to create polyjuice potion, which was quite a feat for a 13-year-old girl.
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