Gameplay wise, there are plenty of activities that you can experience with your friends. One example would be farming, where you can split the workload between the players and everyone could master a specific part of the job. Different Magnus are better at different jobs, so each of the player can choose a different Magnus suited for different parts of farming. If having Magnus do your chores seems too cruel, you can always do it the traditional way by farming manually. Having friends will speed up the progress significantly.
Most of the features in the game are built around multiplayer so you will able to enjoy your friend's company throughout the game.
Amount of Players