EOS Online Subsystem (OSS) is a set oftools and APIs provided by Epic Online Services (EOS) for integrating online multiplayer functionality into Unreal Engine games and applications. In platforms like Arcane Mirage, EOS OSS facilitates features such as matchmaking, player authentication, leaderboards, and cloud storage. By leveraging EOS OSS, developers can implement scalable multiplayer experiences, manage player sessions, and synchronize game state across devices and platforms. Integration with EOS OSS enhances the multiplayer capabilities of Unreal Engine applications, supporting cross-platform play, social interactions, and community engagement in online gaming and virtual environments.