I honestly have no idea at all why Lucius put the diary in Ginny's cauldron. It is never explained. NEVER. At least so far as I recall. If it was, it was done badly. I believe he only put in the Lifestone because he was forced, but that doesn't make sense either. The only reason he gave Ginny the diary in canon was he wanted to discredit Arthur by having his daughter be caught with a Dark and dangerous object.
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Date: 2010-09-05 02:30 am (UTC)