Most dictionaries seem to list "wrought" as an archaic past tense of "work" only, its use as a past tense of "wreak" apparently being a misunderstanding. Here I read it to mean "fashioned", "brought about". This sense, even if originally a past tense of "work", now seems to have taken on a life of its own and in this context does, to me, seem coloured by the association with "wreak".
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