My question is, what exactly is the criteria that makes the set of groups for x gnw? Because my group is a constant on our set of groups but there are some that shift between sets, so i wonder what exactlt determines it. I know one of the criteria is Total power of the group, but is there any other thing that that affects the enemies we will be facing? Because we always face the same groups, and we are always the group with least power and from the most recent server when compared to our enemies.