The Subtle Knife

The knife is so strong it can cut any object, including doorways to other worlds. It can (and does) cause great harm when it is in the wrong hands. It is made out of the same material used to separate children from their daemons in the experiments at Bolvangar.

The Green Leather Case

The case is where Will's mother keeps a few precious airmail letters from Will's father, sent when he was exploring in the north. Will manages to find them and keep them from the strange men who bother his mother and break into his house.

The Alethiometer

The alethiometer is a small intricate device that tells the truth. Lyra is the only person in the book who can use it, and she has a natural ability. It is inscribed with images around the corners and a compass-like point swings from picture to picture...