Why, Yrael?” it said, as the last of the dark gave way to silver, and the shining sphere of metal sank slowly to the ground. “Why?” “Life,” said Yrael, who was more Mogget than it ever knew. “Fish and fowl, warm sun and shady trees, the field mice in the wheat, under the cool light of the moon.
Garth NixI don't do all the background and the worldbuilding before I start the story. What I do is I work out the bare minimum I need to start the story, and often that really is a bare minimum - it's a character in a situation, and I know nothing about the character, I know nothing about the situation, and then I think about it for a long time, and make notes about where I think the story is going to go and so on, but I don't really make notes to do with the background or the magic system or the world.
Garth Nix