Just that Familiar bonds are considered to be the most important ritual here by the spirits. It forms a psychic bond between a Familiar and a Myth or Legend which can manifest in various ways?

I've been looking for information on if these bonds can be broken later on, but apparently that's a taboo thing to discuss.

[ He sighs. ]

With such an emphasis on the significance of these bonds there must be an important purpose to them beyond what's obvious.