Galahad thinks of the only folklore he knows, which are the Welsh stories Percival used to tell him, of Manawydan and Brân Fendigaidd, Lleu Llaw Gyffes, and his sister, Arianrhod, Taliesen the bard. These aren't what he means. There are house spirits, bwbachod and bwac, but these aren't what he means either -- he's thinking of something more powerful, though perhaps equally precise in scope.

He shakes his head, and then says, "Lan Wangji says there is a god here. He is sustained through belief, so Lan Wangji has made a shrine for him. I think the gods of this place must do the things they do here so we do not stop thinking about them."