I know that some mobs in some zones are using way points or at least a system of waypoint with a distance allowed ( i.e. it does not follow a strict path from way point to way point )
a good exemple of that are mams in everfrost or even the dark assassin in the same zone ( I know it cause I've played like 40 lvls in this zone lol )
and I'm sure its not the only zone like that ,
so when they are roaming they generaly are following a path or they are restricted in a certain area , but I think that a waypoint system is the most easy system to make with the little drawback that it would require a pathing table for every mob using this specificity
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