When an invasion triggers, the game exempts a handful of servers from its effects (green sky, countdown notice, and the invasion itself) so players can opt out of the event if they wish to. Do these servers change between each invasion, or are they fixed? If they are randomized, I would like to request that they become fixed so there are always a handful of servers that players can go to without ever having to think about invasions. It can be annoying when an invasion suddenly triggers while you're doing something unrelated to it on that server. For example, I usually switch servers if I am looting a boss on an invasion server since the accompanying lag makes the experience much less pleasant.