Level 18 pals is an off handed generalization.
Generalizations are used when it would be inefficient to state the exact scope of a target object. For instance, if I had written "brought fellow hordies who are between the levels of 15-20 and may be close game friends, new acquaintances, or even random who are interested in the following activities," it would have been both uneccessary and over specific.
Seriously hopes this explanation aids you in future communication.
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