ImmortalsCO is a free-to-play private server for Conquer Online, presenting itself as a long-running destination for players seeking a martial arts MMORPG experience. Operating since 2011, the community-focused game combines player-versus-player battles with player-versus-environment gameplay and features nine classes. Its world centers on conflict between the Dragon Warrior and the Ninja, inviting players to choose a side and take part in the struggle to restore light to a dimmed world.

The server offers daily wars, PvP battles, monthly events, and regular game updates. Featured activities include Hula Summer and TeamDeathMatch seasons, while rankings highlight leading players and guilds. ImmortalsCO also provides a community website with account creation, downloads, game guides, support, rules, and server information. The site promotes anti-cheat protection and ongoing maintenance as part of its service. Players can follow news and updates, view community videos, and connect through Facebook. ImmortalsCO states that it is not associated with or endorsed by TQ NetDragon.