What kind of game is your dream game?

A game where the physics are almost that of real-life and a MASSIVE open-world that could take you days to explore in a fantasy-like setting, a game where you could make a name for yourself and have people react to your actions in the virtual world. Some elder scrolls games got close to this, but there hasn't been a game where I feel like I'm actually playing a part in the world and changing it, stories need to be unique for each player and not a flat-lined quest that everyone completes.