There were enough topics on this. Lock. But OK, to repeat why we don't limit boxes: There's literally NO technical way to limit it. Anyone can have three virtual machines or two notebooks. Now it's absolutely fair - if you have nerves and time to play with 5 characters at a time, go for it. If you don't, find some people and play in party - it will be much better for you. There's no way to punish violations of this because we can't look into crystal ball and see how man