Friday Fictioneers: The Locked Box

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What does this mean ? My confusion was growing reading the note that I found along with the requested key .

“I’m sorry to burden you with the truth of your inheritance. You are a great witch and you will be a destroyed by a destructive force for evil if not stopped. I’m sorry I can’t explain in person how important it is that you do not open the box . You are going to have very little time before the madness begins- take this box and flee ! “

“But more importantly , how are you going to take that box anywhere when you are locked inside it , ” a voice I didn’t recognize asked laughingly .