How do you use dark magic in diagon alley and knockturn alley after you've completed the whole game??
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You have to use a dark magic character, but you can only buy them if you've unlocked them/found their character token. You buy them at Madam Malkin's(next to WWW) in Diagonal Alley!
Use the potion pot in the leaky cauldron to change into DM character
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