The answer is simple: we don't know. It probably depends a lot on the relationship between the number of online players in the world and the number of Goblins killed in the invaded cities. I use these two pieces of information separately, for example: 1) we know that there are worlds in Tibia with a very small population of players, I have already seen worlds with only 20 people online on the official website so if by chance the invasions had the right amount to occur 50 for example) it doesn't make sense to happen so many invasions for so few players online (not taking into account the strength of the creature in question that it is obvious that a level 8 would surely kill 50 invasions if he had the opportunity to do it alone ... anyway) ; 2) regarding the death of the Goblins if by chance a city is forgotten and the respective invasions occur only in it, there would be a large number of buggy creatures on top of each other (analyzing this question as a hypothesis since this has never happened until then) therefore in my view, the creatures have to be killed for a new invasion to occur in a certain place.
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