High Quality Content by WIKIPEDIA articles! Regnum Online is a fantasy massively multiplayer online role-playing game (MMORPG) developed by NGD Studios, a game development studio located in Argentina. This game is also known as "Realms Online" in America. In addition to the usual character development present in other games of the genre, the game focuses on the conflict of three realms in which players take part, fighting against characters of opposing factions and capturing fortresses and castles aside from the usual player vs monster combats.