Nothing believes them. These are seeds being planted which are growing spiders. Growing spiders need milk to make strong bones. Mad spiders all over the place. I miss the urth.
Spiders are very interesting folks.
Most of them are thieves who do not want anything. If you are thief who does not want anything this does not mean you are a spider. It shows, rather, your lack of creativity. Nothing left, 'cept chapstick. Spiders have needs of webbing.