Mugwort rain area-specific?

When an NPC gets enough life crystals, will the special rain occur in just the area he governs, or everywhere? And are the channels synchronized or separate?

I think everywhere. Bro was in dunby and I was in emain. Both rained. o -o Channels? Idk.

Its most likely all channels and all towns since the headers the same no matter where you are, and everyone's life crystals stack together