There's not very much to explain. Just vote in the poll and we can get some discussion.
Personally I'm not entirely sure. I think that "on" makes more sense, but "of" sounds better. I'll vote for "on".
Personally I'm not entirely sure. I think that "on" makes more sense, but "of" sounds better. I'll vote for "on".

The word "of" in the title would make sense if there was a wizard living _on_ Mars that the wizards of Earth met at some point in the book, and the book is focused on this wizard! Yeesss! I actually made a good prediction in the spoiler forums!
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