The answer to the question on whether the bolded part contains an error is this:
The bolded part does not need a correction because it describes the quality or state of being. Often, words that describe the quality or state of being are nouns.
In the bolded portion of the text, three qualities are mentioned and they are; harshness, beauty, and power. All of these are nouns that describe the quality or state of being. They are the right forms of the words so no correction is needed.
Learn more about nouns here:
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