Question: In what year was the author of the book series which had the character Opal Koboi born?
Sentence (from "Opal Koboi"): After the character's introduction in in the series as a supporting antagonist, Colfer again used Koboi as the main antagonist of the fourth, sixth, and eighth books in the series, giving her the status of archenemy to Artemis Fowl II.
Relevant evidence: No