Poetry (the term derives from a variant of the Greek term, poiesis, "making") is a form of literature that uses<span> aesthetic and rhythmic qualities of </span>language<span>—such as phonaesthetics, sound symbolism, and metre—to evoke meanings in addition to, or in place of, the prosaic ostensible meaning.</span>
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The verb in this sentence is "became" as it indicates the action of the subject (the defendant), which is what he/she did.
Hope this helps!
Adverbs usually end in -ly, so Brilliantly = adverb.
