I am wondering how the Dark Brotherhood operated with multiple semi-independent sanctuaries across an entire continent and only 1 Night Mother, I am fairly new to Elder Scrolls lore. Were there multiple Night Mothers? Or did the sanctuaries besides the main one do something similar to what Astrid did? I can't imagine a secret organization could set up such a robust network of communication that the more rural sanctuaries could get up to date assassination orders from a continent away. Or could the Night Mother create and talk to listeners remotely?