Mortal online uses and what engine made by a  Cary, North Carolina based video game development company?
Mortal Online:  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. 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.
Unreal Engine 3