Question: Decima best known for its use in  an action role-playing video game released in early 2017, is a what?
Context: Ys: The Ark of Napishtim (イースVI -ナピシュテムの匣- , Īsu Shikkusu -Napishutemu no Hako- ) is an action role-playing video game developed by the Nihon Falcom, and the sixth installment in the "Ys" video game series.  It was first released in 2003 for Microsoft Windows.  Not counting the Eternal/Complete remakes of "Ys I" & "II", it was the first new "Ys" game released by Falcom in eight years.  The name "Napishtim" is a reference to the character Utnapishtim from the "Epic of Gilgamesh". Dragon View, is a side-scrolling role-playing video game released for the Super Nintendo Entertainment System in November 1994.  Released in Japan as Super Drakkhen (スーパードラッケン ) and otherwise known as Drakkhen II, it is meant to be a sequel to "Drakkhen" although it bears little resemblance to its predecessor.  It uses the same pseudo-3D overworld system for which the series is most famous.  Other features of "Dragon View" are its side-view action role-playing game (RPG) hybrid gameplay (used when exploring more detailed areas such as towns and dungeons), its well translated first person storyline, and its emphasis on player-driven undirected exploration. Decima is a proprietary game engine developed by Guerrilla Games, released on November 15, 2013.  It houses tools and features for creating artificial intelligence, physics, logics and worlds within development as well as compatibility with 4K and HDR.  It is best known for its use in "Killzone Shadow Fall", "Until Dawn", "" and "Horizon Zero Dawn", as well as the upcoming game "Death Stranding". The Elder Scrolls IV: Oblivion is an action role-playing video game developed by Bethesda Game Studios and published by Bethesda Softworks and the Take-Two Interactive division 2K Games.  It is the fourth installment in "The Elder Scrolls" action fantasy series, following "" and preceding "".  The game was released for Microsoft Windows and Xbox 360 in March 2006, and on PlayStation 3 in March 2007, with a mobile version of the game released on May 2, 2006.  Taking place within the fictional province of Cyrodiil, "Oblivion"' s main story revolves around the player character's efforts to thwart a fanatical cult known as the "Mythic Dawn" that plans to open portal gates to a demonic realm known as "Oblivion".  The game continues the open world tradition of its predecessors by allowing the player to travel anywhere in the game world at any time and to ignore or postpone the main storyline indefinitely.  A perpetual objective for players is to improve their character's skills, which are numerical representations of certain abilities.  Early in the game, seven skills are selected by the player as major skills for their character, with those remaining termed as minor skills. Nihon Falcom Corporation (日本ファルコム株式会社 , Nihon Farukomu Kabushiki-kaisha ) is a Japanese video game company.  The company was founded in March 1981 by Masayuki Kato.  Falcom has played a definite role in the growth and development of the Japanese personal computer software industry.  The company released one of the first Japanese role-playing video games in 1983 and followed with real-time action and adventure games as well as games with fully developed soundtracks.  They are credited with pioneering the action role-playing game genre and the Japanese role-playing game industry, and remain one of the oldest role-playing game developers still in existence today. Scalebound (Japanese: スケイルバウンド , Hepburn: Sukeirubaundo ) was an action role-playing video game that was being developed by PlatinumGames.  The game had been scheduled to be released in 2017 for Xbox One and Microsoft Windows, with Microsoft Studios publishing the title.  Microsoft announced the cancellation of "Scalebound"' s development in January 2017.  In this game, players would assume control of Drew, who is accompanied by a dragon called Thuban.  Players could use a variety of weapons to defeat enemies, and could issue commands to the dragon, which assisted players during battles.  Unlike other games developed by PlatinumGames, the game put more focus on graphical qualities and the role-playing aspect instead of action. Deus Ex: Invisible War is an action role-playing video game developed by Ion Storm and published by Eidos Interactive for Microsoft Windows personal computers (PC) and the Xbox home console.  The game released in 2003 in North America and 2004 in other regions.  It is the second game in the "Deus Ex" series, and a direct sequel to the original game.  The gameplay—combining first-person shooter, stealth and role-playing elements—features exploration and combat in environments connected to multiple city-based hubs, in addition to quests that can be completed in a variety of ways and flexible character customization.  Conversations between characters feature a variety of responses, with options in conversations at crucial story points affecting how some events play out. Horizon Zero Dawn is an action role-playing video game developed by Guerrilla Games and published by Sony Interactive Entertainment for PlayStation 4 and released in early 2017.  The plot revolves around Aloy, a hunter and archer living in a world overrun by robots.  Having been an outcast her whole life, she sets out to discover the dangers that kept her sheltered.  The character uses ranged weapons and a spear and stealth tactics to combat the mechanised creatures, whose remains can be looted for resources.  A skill tree provides the player with new abilities and passive bonuses.  The game features an open world environment for Aloy to explore, divided into tribes that hold side quests to undertake, while the main story guides her across the entire map. The Witch and the Hundred Knight 2 (魔女と百騎兵2 , Majo to Hyakkihei 2 ) is an action role-playing video game developed and published by Nippon Ichi Software for the PlayStation 4.  Featuring a different witch than its predecessor "The Witch and the Hundred Knight", the game released on February 23, 2017 in Japan.  A western release of the game is not announced yet. Square Enix is a Japanese video game development and publishing company formed from the merger of video game developer Square and publisher Enix on April 1, 2003.  The company is best known for its role-playing video game franchises, which include the "Final Fantasy" series, the "Dragon Quest" series, and the action role-playing "Kingdom Hearts" series.  Since its inception, the company has developed or published hundreds of titles in various video game franchises on numerous gaming systems.  Of its properties, the "Final Fantasy" franchise is the best-selling, with a total worldwide sales of over 110 million units.  The "Dragon Quest" series has shipped over 66 million units worldwide and is one of the most popular video game series in Japan, while the "Kingdom Hearts" series has shipped over 22 million copies worldwide.
Answer: a proprietary game engine