OpenDiablo2/OpenDiablo2 ? reverse-engineered prompt

Build me a cross platform open source Diablo 2 style game engine in Go that can run the game if the user already has a legally purchased copy of Diablo 2 and Lord of Destruction installed.

I want it to feel like the original game, with a main menu, hero select, gameplay, inventory, and the usual in game panels working well enough to actually play. Keep it organized so the engine, game logic, networking, scripting, and shared code are separated cleanly, and make sure it can be built and run on Windows, Mac, and Linux.

Please include a simple way to point the app at the game files on disk, and make the setup instructions clear for someone who just wants to install it and play. If anything about the current docs or asset loading is unclear, look up the current project info online and follow that.