We decided that Cornflower (we picked something blue, because we had to ask our fellow player what the “something old, something new, something borrowed” reference was) was a god of dreams and fantasies - in rituals, usually involving music like lullabies, our Vessel would be possessed by a spirit from Cornflower. And it (our Vessel) didn’t actually get to remember what that spirit did, so when the first spirit summoned by the Believer showed the path they’d need to take on a map … well, that left our Vessel forced to follow the Believer’s guidance.