Sometimes it is very lonely to go alone and sometimes it is really dangerous to not have a support behind your back. I’ve implemented party system! Not that one, where everyone gets drunk and piss in the sink. The one, that is common in RPG games. Where all party members are care about each other on try to reach for common goal!
I’ve implemented system, where you can ask other fighters to join your party. They will follow you and when they see enemy nearby, will attack it. No questions asked. They are not very smart, but they will fight till death, no matter what. There is no way to directly control them, just like with your real friends.