Question: In what year was the author of the book series which had the character Opal Koboi born?

full_context: Document 1: Elaith Craulnober: Elaith Craulnober is a fictional character in the Forgotten Realms fantasy campaign setting for the "Dungeons & Dragons" fantasy role-playing game. Elaith is often used by author Elaine Cunningham and has appeared in many of her novels, namely, "Elfshadow", "Elfsong", "Silver Shadows", "Dream Spheres", and briefly as a very young child in "Evermeet: Island of Elves". He is often portrayed as a cunning and opportunistic elven rogue with an infamous reputation, although the Forgotten Realms campaign setting presents him as a fighter/wizard. The author uses him both as an antihero and a recurring villain, and is often referred as "The Serpent." Elaith has also made an appearance in Neverwinter Nights as a merchant who has taken up a calmer outlook on life.
Document 2: Foaly: Foaly is a fictional character in the Artemis Fowl series written by Eoin Colfer. He is the technical consultant to the Lower Elements Police (LEP). He is the most intelligent centaur on and under the Earth, considers himself to be an unappreciated genius, and is the inventor of most of the advanced technology possessed by the fairy world, rivaled only by Opal Koboi.
Document 3: Antagonist: An antagonist is a character, group of characters, institution or concept that stands in or represents opposition against which the protagonist(s) must contend. In other words, an antagonist is a person or a group of people who opposes a protagonist.
Document 4: Obert Skye: Obert Skye is a bestselling American children's writer known for the "Leven Thumps" series, the "Pillage" trilogy,[1] and "The Creature from My Closet" series. He is also the author of "Witherwood Reform School" and "Beyond Foo".
Document 5: Robin Hobb: Robin Hobb is the pen name of Margaret Astrid Lindholm Ogden (born March 5, 1952), an American writer. She is best known for the books set in the Realm of the Elderlings, which started in 1995 with the publication of "Assassin's Apprentice", the first book in the Farseer trilogy.
Document 6: Eoin Colfer: Eoin Colfer ( ; born 14 May 1965) is an Irish author of children's books. He worked as a primary school teacher before he became a full-time writer. He is best known for being the author of the "Artemis Fowl" series. In September 2008, Colfer was commissioned to write the sixth installment of the "Hitchhiker's Guide to the Galaxy" series, entitled "And Another Thing ...", which was published in October 2009.
Document 7: Opal Koboi: Opal Koboi is a fictional character from the Artemis Fowl series by Eoin Colfer. 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.
Document 8: Joseph O'Connor: Joseph Victor O'Connor is an Irish novelist. His 2002 historical novel "Star of the Sea" was an international number one bestseller. Before success as an author he was a journalist with the "Sunday Tribune" newspaper and "Esquire magazine". He is a regular contributor to Raidió Teilifís Éireann (RTÉ). He is a member of the Irish artists' association Aosdána.
Document 9: The Third Policeman: The Third Policeman is a novel by Irish writer Brian O'Nolan, writing under the pseudonym Flann O'Brien. It was written between 1939 and 1940, but after it initially failed to find a publisher, the author withdrew the manuscript from circulation and claimed he had lost it. The book remained unpublished at the time of his death in 1966. It was published by MacGibbon & Kee in 1967.
Document 10: Butler family (Artemis Fowl): The Butler family is a family of martial arts masters in the fictional series Artemis Fowl by Eoin Colfer. There are only four characters who are mentioned: Domovoi Butler ("Butler") and his younger sister Juliet, who are major characters, and Butler's uncle, known only as "the Major", and Virgil Butler.
Document 11: Fawful: Fawful, known in Japan as Gerakobits (ゲラコビッツ , Gerakobittsu ) , is a fictional character appearing in the "Mario & Luigi" series of role-playing video games developed by AlphaDream. The character is considered to be "insane," and often serves as either the main antagonist or the sidekick to the main antagonist in the games.
Document 12: Brian O'Nolan: Brian O'Nolan (Irish: "Brian Ó Nualláin" ; 5 October 1911 – 1 April 1966) was an Irish novelist, playwright and satirist, considered a major figure in twentieth century Irish literature. Born in Strabane, County Tyrone, he is regarded as a key figure in postmodern literature. His English language novels, such as "At Swim-Two-Birds", and "The Third Policeman", were written under the "pen name" Flann O'Brien. His many satirical columns in "The Irish Times" and an Irish language novel "An Béal Bocht" were written under the name Myles na gCopaleen.
Document 13: Artemis Fowl: The Opal Deception: Artemis Fowl: The Opal Deception (known as Artemis Fowl and the Opal Deception in Europe) is a teen fantasy novel published in 2005, the 4th book in the Artemis Fowl series by the Irish author Eoin Colfer. Preceded by " "and followed by "", it is centred on the brilliant pixie Opal Koboi's second try at rebellion (after her was a failure) and Artemis Fowl II and his fairy comrades' efforts to stop her. Critical reception was mixed, with some reviews praising the book but others pointing out confusion and poor writing. Artemis Fowl is not seen in the book as much as Opal Koboi.
Document 14: Gareth P. Jones: Gareth P. Jones is a British children's writer, and author of the Dragon Detective Agency series of books. He is most famous for his comic-gothic book, "The Considine Curse", which won the Blue Peter Book of the Year 2012 and for "The Thornthwaite Inheritance". He also writes a series of books called Ninja Meerkats. His most recent book is called "Constable & Toop" and is a Victorian ghost story set in London, 1884. [Update: His most recent book is now "The Society of Thirteen".] As well as being an author, Gareth works as a TV producer.
Document 15: Lady of the Green Kirtle: The Lady of the Green Kirtle, also called Queen of Underland and Queen of the Deep Realm, is the main antagonist in "The Silver Chair" by C. S. Lewis. She is sometimes called briefly the "Green Lady" (on analogy with Jadis, the "White Lady"), and she is known also as the "Emerald Witch"; neither name, however, appears in Lewis's text. She enslaved Prince Rilian of Narnia and a horde of gnomes by her witchcraft, and planned to use them to take over Narnia. She is foiled by three friends of Aslan: Eustace Scrubb, Jill Pole, and Puddleglum.
ground_truth: 1965