Recently EmberWave introduced multiplayer for Lies of P on Nexus Mods. Initially, the game was created as a single-player game, it did not have network functions:
After more than a year of reverse engineering and system development, this project has emerged, which will allow players to play cooperatively, exploring the world, fighting and progressing through the story together.
The developer noted that the final goal of the creators of «Lies of P Coop» is to offer players a completely seamless cooperative.
The project is currently in the alpha testing stage and so far the only completed mode is the joint boss battle (Boss Rush), and work is already underway on a «full-fledged» cooperative.