#WordWeavers Day 5: Share an interesting fact about the society your characters live in.
I'll take this one as the magical sub-society, rather than our own society. So: Every city shaman has a mentor, chosen for them by the City when the new shaman awakens. All the way back to the first one, Juana Lucia Hernandez Argüello, who awoke in 1850. The City mentored her on its own.
It tries to choose people who will get along well together, but results vary.