Question: What disappeared in "Sonic Chronicles" after the defeat of the main antagonist of the series?

full_context: Document 1: Mega Man: Mega Man, alternatively written as Megaman and MegaMan, known as Rockman (ロックマン , Rokkuman ) in Japan, is a video game franchise created by Capcom, starring the robot character Mega Man, or one of his many counterparts. "Mega Man", released for the Nintendo Entertainment System in 1987, was the first in a series of over 50 games on multiple systems. By March 2015, the series had sold approximately thirty million copies worldwide,
Document 2: Dark Chronicle: Dark Chronicle (Japanese: ダーククロニクル , Hepburn: Dāku Kuronikuru ) , released as Dark Cloud 2 in North America, is an action role-playing game developed by Level-5 and published by Sony Computer Entertainment for the PlayStation 2. It was released in Japan in November 2002, in North America in February 2003, and in Europe in September 2003. The game is a spiritual sequel to the 2000 game "Dark Cloud", with the same basic game mechanics - action role-playing combined with elements of city-building games - but features mainly different characters and an unrelated plot.
Document 3: Sonic Chronicles: The Dark Brotherhood: Sonic Chronicles: The Dark Brotherhood (Japanese: ソニッククロニクル 闇次元からの侵略者 , Hepburn: Sonikku Kuronikuru: Yami Jigen Kara no Shinryaku sha , lit. "Sonic Chronicles: Invaders from the Dark Dimension") is a role-playing video game developed by BioWare and published by Sega for the Nintendo DS. The game was BioWare's first handheld video game project, and is a part of the "Sonic the Hedgehog" series. "Sonic Chronicles" initially focuses on the events surrounding the kidnapping of Knuckles and the disappearance of the Chaos Emeralds after the defeat of Doctor Eggman, before moving on to follow the cast of characters across two dimensions as they encounter a new ally, Shade the Echidna, and seek to stop the invasion of their world by Ix, the leader of Shade's tribe, the Nocturnus.
Document 4: Warlocked: Warlocked is a real-time strategy video game developed by Bits Studios and published by Nintendo for the Game Boy Color. Critical reception towards the game was positive, it received a score of 86% on review aggregation website GameRankings. IGN named the game as the Best Game Boy Strategy game of 2000, and would later list the game as one they would like to see on a hypothetical Virtual Console platform for the Nintendo DSi, owing partially due to its real-time strategy interface. A sequel to the game, titled "Wizards", was in development for the Game Boy Advance, but was cancelled due to the lack of a publisher.
Document 5: Sonic Team: Sonic Team (Japanese: ソニックチーム , Hepburn: Sonikku chīmu ) is a Japanese video game development division of Sega. The division was established as Sega AM8 in Ōta, Tokyo, Japan in 1988, and was renamed to Sonic Team in 1991 after the release of "Sonic the Hedgehog" for the Sega Genesis home console. The game was a huge commercial success for Sega, and started the long-running "Sonic the Hedgehog" franchise. In the mid 1990s, the studio began to create and develop new intellectual properties, whilst continuing to oversee production on the "Sonic" series.
Document 6: Dr. Wily: Doctor Wily (Dr.ワイリー , Dokutā Wairi ) , ( ) full name Albert W. Wily, is a video game character and the main antagonist of the original "Mega Man" series. He appeared in the first "Mega Man" video game and later in promotions and other media related to the series. In Japanese, he is voiced by Takeshi Aono in all appearances except "" and its sequel, as well as "", where he instead was voiced by Kenichi-Ogata; in English, the character is voiced by Dean Galloway, Douglas Kendall, Ian James Corlett and Scott McNeil voicing the character in "Mega Man Powered Up", "Mega Man 8", "", and the animated series, respectively.
Document 7: Project X Zone 2: Project X Zone 2, known in Japan as Project X Zone 2: Brave New World (プロジェクト クロスゾーン2：ブレイブニューワールド , Purojekuto Kurosu Zōn 2: Bureibu Nyū Wārudo ) , is a crossover tactical role-playing game for the Nintendo 3DS developed by Monolith Soft and published by Bandai Namco Entertainment. Despite the game being the official sequel to "Project X Zone", the plot is a homage to the events of its spiritual predecessor: "Namco x Capcom" whilst retaining a standalone story. The game is a crossover between various franchises from Bandai Namco Entertainment, Capcom, Sega, and Nintendo. The title was released in Japan in November 2015, and worldwide in February 2016.
Document 8: Resident Evil: The Darkside Chronicles: Resident Evil: The Darkside Chronicles, known as "Biohazard: The Darkside Chronicles" (バイオハザード／ダークサイド・クロニクルズ , Baiohazādo/Dākusaido Kuronikuruzu ) in Japan, is an on-rails shooter video game for the Wii developed by Capcom and Cavia and the 16th installment of the "Resident Evil" series. The game was released for the Wii on November 17, 2009 in North America. It serves as a prequel to "Resident Evil 4", setting 2 years before its events. It was released in Europe on November 27, 2009 bundled with the Wii Zapper accessory.
Document 9: Doctor Eggman: Dr. Ivo "Eggman" Robotnik (ドクター・エッグマン , Dokutā Egguman , ロボトニック "Robotonikku") is a fictional character and the main antagonist of Sega's "Sonic the Hedgehog" series. His original character designer was Naoto Ohshima, who created the character as part of many design choices for the company's new mascot. After the creation of Sonic the Hedgehog, Ohshima chose to use his previous egg-shaped character to create the antagonist of the 1991 video game, "Sonic the Hedgehog", as well as making him become the archenemy of the series' titular main character.
Document 10: White Knight Chronicles II: White Knight Chronicles II is a video game developed by Level-5 and published by Sony Computer Entertainment in Japan and Europe as well as D3 Publisher in North America for the PlayStation 3. The game is a direct sequel to the 2008 title "White Knight Chronicles" and was announced at TGS 2009. The game was released in Japan on July 8, 2010, in PAL regions in June 2011, and in North America on September 13, 2011. On June 18, 2013, the server for the game was shut down by D3Publisher and Sony Computer Entertainment America.
Document 11: Sonic the Hedgehog: Sonic the Hedgehog (Japanese: ソニック・ザ・ヘッジホッグ , Hepburn: Sonikku za Hejjihoggu ) is a video game franchise created and produced by Sega. The franchise centers on a series of speed-based platform games. The protagonist of the series is an anthropomorphic blue hedgehog named Sonic, whose peaceful life is often interrupted by the series' main antagonist, Doctor Eggman. Typically, Sonic—usually along with some of his friends, such as Tails, Amy, and Knuckles—must stop Eggman and foil any plans of world domination. The first game in the series, released in 1991, was conceived by Sega's Sonic Team division after Sega requested a mascot character. The title was a success, it spawned many sequels, and it transformed Sega into a leading video game company during the 16-bit era in the early to mid 1990s.
Document 12: Sonic the Hedgehog Pocket Adventure: Sonic the Hedgehog Pocket Adventure (ソニック・ザ・ヘッジホッグポケットアドベンチャー , Sonikku za Hejjihoggu Poketto Adobenchā ) , or Sonic Pocket Adventure for short, is a 1999 platform video game in the "Sonic the Hedgehog" series developed by SNK. It was released in December 1999 in North America, and May 2000 in Japan, exclusively for the Neo Geo Pocket Color handheld game console. It is also only the second game of the Sonic series ever to be released on a non-Sega video game console, the first being "Sonic Jam" on the Game.com. The game was praised by critics, receiving perfect scores from multiple reviews.
Document 13: Sonic the Hedgehog 2 (8-bit video game): Sonic the Hedgehog 2 (ソニック・ザ・ヘッジホッグ2 , Sonikku za Hejjihoggu Tsū ) is a side-scrolling platform video game developed by Aspect and published by Sega for the Master System and Game Gear. The Master System version was released in Europe on October 1992. The Game Gear version was released first in Europe in October 1992, and in North America and Japan in the following month.
Document 14: Sonic &amp; Knuckles: Sonic & Knuckles is a platform game developed by Sonic Team and published by Sega for the Sega Genesis. Released on October 18, 1994, it is an installment in the main "Sonic the Hedgehog" series and a direct sequel to "Sonic the Hedgehog 3", which released earlier that year. It follows Sonic the Hedgehog and Knuckles the Echidna in their respective quests to save Angel Island; Sonic tries to prevent Dr. Robotnik from relaunching his orbital weapon, the Death Egg, while Knuckles scuffles with Robotnik's minion, known as EggRobo.
Document 15: Paul Shortino: Paul Shortino (born May 14, 1953) is an American rock singer and musician who has sung for several bands, including Rough Cutt/The Cutt, Quiet Riot, Bad Boyz, and Shortino. He briefly recorded with J.K. Northrup as the duo Shortino/Northrup. He has also recorded as a solo artist, writing and performing the song "E.G.G.M.A.N." as the theme for Dr. Eggman in Sonic Adventure 2 for Sega (this song was later revised by Remix Factory in Shadow the Hedgehog as "E.G.G.M.A.N. Doc Robeatnix Mix"). In 1985, Shortino recorded lead vocals for the Heavy Metal benefit project Hear 'n Aid. The single from this project, "We're Stars" also features lead vocals by heavy metal singers Ronnie James Dio, Rob Halford, Geoff Tate, Don Dokken, Kevin DuBrow, Eric Bloom and Dave Meniketti.
ground_truth: the Chaos Emeralds