Crysknife

A knife whose blade comes from the tooth of a dead Sandworm. The Crysknife is far more than just a cool sci-fi dagger, it is the ultimate holy relic of the Fremen people and a symbol of life, death, and religious law on Arrakis. A crysknife is carved from a tooth shed by a giant sandworm (Shai-Hulud). Because the Fremen worship the sandworm as a literal god of the desert, the knife is viewed as a piece of deity. It is a double-edged blade that glows with a faint milk-white light, and it is deadly sharp. The weapon is deeply tied to spiritual rules. The most famous law is that a crysknife must never be seen by an outsider, and once unsheathed, it cannot be put away until it has drawn blood. If a Fremen draws their knife, they must nick themselves or their opponent before sheathing it. Furthermore, an unfixed crysknife will chemically disintegrate and crumble into dust if it is kept away from the electrical field of a living human body for too long. Frank Herbert used the crysknife to show how deeply the Fremen are connected to their environment. Their most sacred weapon doesn’t come from a factory or advanced technology, it comes directly from the apex predator of their planet. Giving a crysknife to Paul Atreides is the ultimate sign that the Fremen are beginning to accept him as one of their own.