Mortal online uses and what engine made by a  Cary, North Carolina based video game development company?
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.
Oxygen Games Oxygen Games was a developer and publisher of video gaming entertainment for major console platforms including the Nintendo DS, Wii, PlayStation 2 and PlayStation Portable, as well as for the PC. The company was incorporated in 2004 and is headquartered in Northamptonshire UK with North American operations based in Twain Harte, California.