Question: Mortal online uses and what engine made by a  Cary, North Carolina based video game development company?

Context paragraphs:
Derek Smart: Derek K. Smart is an American video game designer.  He is the president and lead developer of 3000AD, Inc., an indie game development company based in Aventura, FL.  In addition he is the president of and investor in the video game development company Quest Online.  Smart is an independent video game designer and software developer, and the creator of several video game series.

Paradigm Entertainment: Paradigm Entertainment (previously part of Paradigm Simulation) was an American video game development company.  Paradigm is perhaps best known for its vehicle simulation games. Founded as a 3D computer graphics company in 1990, Paradigm primarily worked on realistic flight simulation technology for major space and aviation clients.  The company got its start in game development when it was contacted by Nintendo in 1994 to aid in the creation of one of the Nintendo 64's launch titles, "Pilotwings 64".  The game was a critical and commercial success for the developer, causing the simulation and entertainment divisions of Paradigm to separate and focus on their respective products.  The newly independent Paradigm Entertainment continued to develop for Nintendo's 64-bit console.  After a short partnership with Video System, Paradigm was acquired as a wholly owned subsidiary of Infogrames in 2000 and began developing games for sixth-generation video game consoles.  Paradigm was sold to THQ in 2006 and was ultimately closed in 2008.

Epic Games: Epic Games, Inc. (formerly Potomac Computer Systems and later Epic MegaGames, Inc.) is an American video game development company based in Cary, North Carolina, partially owned by Tencent.  Founded in 1991, it is best known for the development of Unreal Engine technology, which has powered its in-house "Unreal", "Gears of War" and "Infinity Blade" series as well as many other games, and has been awarded by Guinness World Records as the "most successful video game engine".

Infamous Quests: Infamous Quests is an indie video game development company that produces point and click adventure games.  It was founded in 2012 by Steven Alexander and Shawn Mills who previously founded Infamous Adventures, an amateur game development company that remade old Sierra Entertainment adventure games of the early 1990s.  The two chose to form Infamous Quests in order to separate it from their free fan-remake development company and in 2012 they announced "Quest for Infamy", an adventure RPG made with Adventure Game Studio where the player assumes the role of the morally gray William Roehm.  The developers raised $63,281 on Kickstarter to produce "Quest For Infamy", and in June 2014 the game made Time Magazine's "20 Video Games To Watch for Summer 2014" list.

Kenn Hoekstra: Kenn Hoekstra (born October 1, 1973), is an executive producer for the game development company Pi Studios in Houston, Texas.  He is probably best known for his game development, marketing and promotional work as a Level Designer and Project Administrator at Raven Software in Middleton, Wisconsin where he worked from February, 1997 to June, 2004.  While employed at Raven Software, Hoekstra wrote a series of articles for Computer Games Magazine, GameSpy and two anthology books aimed at helping aspiring game developers break into game development.  Additionally, he maintains a section of his personal website dedicated to getting a job in the game development industry.

B.B. Studio: B.B. Studio (株式会社B.B.スタジオ , Kabushiki gaisha B. B. Sutajio ) is a Japanese video game development company.  The company in its current form is a result of a merger between Banpresto and BEC by their parent company Bandai Namco.  Before Bandai merged with Namco, both Banpresto and BEC were video game development subsidiaries for Bandai.  In order to streamline the Bandai gaming division, both Bandai gaming development subsidiaries were merged under a single company.

Psyonix: Psyonix Inc. is an American video game development studio based in San Diego, California.  The company was formed in 2000 by Dave Hagewood, after developing Internet and multimedia software under the name WebSite Machines, and legally incorporated on April 30, 2001.  Its first game project was "Proteus".  In 2004, the company moved from its original Satellite Beach, Florida location to Raleigh, North Carolina, to Cary, North Carolina in 2005, and to San Diego, California in 2009.

4mm Games: 4mm Games was a New York–based video game development company founded in 2008 by two founders of Rockstar Games, Jamie King and Gary Foreman along with former Image Metrics exec Nicholas Perrett, and Def Jam Enterprises, Warner Music Group and NBC exec Paul Coyne.  4mm was founded with the intent of bringing the experience of Constantly Connected Gaming to the next generation of gamers.  OBE and former NCSoft CEO Geoff Heath was a member of the advisory board and offers strategic input.

Mortal Online: Mortal Online is a First Person, Open World, PvP/PvE Sandbox MMORPG developed and published by the Swedish independent video game company Star Vault.  Mortal Online was released on June 9, 2010.  The game is inspired by the desire to return to Ultima Online's player-controlled, sandbox-style game design; it uses Epic Games' Unreal Engine 3 and features a skill-based, real-time combat system.

Turbulenz: Turbulenz is a video game development company based in the United Kingdom, and is focused on HTML5 game development.  They created a HTML5 game engine also named Turbulenz.  The company publishes third party video games as well as developing their own.

Supporting paragraphs: Mortal Online Epic Games
Answer: Unreal Engine 3