Maplestory Myths - know any?

I remember a long time ago back before Masteria came and people used Mushmom as the major way of looking for Ilbis, I would hear people say that to make her spawn, you'd have to kill the two fairies that appear on her map in a certain way.

We know the reasoning behind this. It's because the map has like a max mob limit and killing mobs in the map makes room for Mushmom to spawn if the time for it is over.