A Korean MMORPG based on the manhwa Ragnarok by Myung-Jin Lee, released in 2002 by Gravity Co., Ltd, using the engine from their previous game Arcturus. Its popularity spawned the anime Ragnarok the Animation.
Due to numerous hacks that leaked the source code during the beta years of the game, most non-Korean players are on semi-legal emulated private servers.
The game's overall settings and design, particularily its class system, would go on to inspire numerous fantasy MMORPG and media. While the franchise itself also received several spin-offs and reboots over the years, in addition to numerous private servers.
