Question: Mortal online uses and what engine made by a  Cary, North Carolina based video game development company?
Sentence (from "Epic Games"): 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".
Relevant evidence: No