subnautica-ii-coop-bepinex-mod

Install BepInEx 6.0.x into the Subnautica 2 game directory, then extract the DeepSynergy mod into BepInEx/plugins/DeepSynergy. Edit BepInEx/config/synergy_profile.json to set session name, max players, and difficulty options before launching the game.

Open the BepInEx console with F1 and run /start_server to create a session, which returns a shareable session code. Other players join with /join_session followed by that code, using WebRTC with STUN for NAT traversal.

Yes, inventory state is synchronized using Merkle tree verification to detect mismatches between players. Conflicts are resolved by timestamp authority, and you can force a full resync with the /sync_inventory console command.

Connection failures usually come from blocked port 25000, firewall rules on Subnautica2.exe or BepInEx, or mismatched mod versions. Enable debug_mode in the config and check BepInEx/LogOutput.log for WebRTC timeout or version mismatch errors.

Yes, set api_integration.openai.enabled to true in synergy_profile.json and define the OPENAI_API_KEY environment variable. The /api_narrate command then generates short journal entries from gameplay context using the configured model.

The mod supports 2 to 8 players and requires BepInEx 6.0.x IL2CPP with matching versions on all clients. It conflicts with other multiplayer or inventory mods, and performance with 3+ players may require raising creature_spawn_divider or disabling API features.