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.