Nexon proved something with the visitor patch.

False. Ever used a Cash shop item that adds "weather"? Well, the effect can be kept even if you exit and enter the map. Just make a map trigger it, and VOILÁ. Maybe tweak it a bit and it'll stack with cash shop stuff.

Remember when maple didn't even have 3rd job? What about most of the stuff that came afterwards up to today?

Now, can you make a random system to switch between buffs that has weather effects on random intervals that does more then a cosmetic effect? I didn't think so.