Item from Mistborn by Brandon Sanderson
Obsidian or glass knives carried by Mistborn and trained Allomancers. Non-metallic weapons that cannot be Pushed or Pulled by Coinshots and Lurchers, essential for fighting other Allomancers.
Glass daggers exist because of Allomancy's fundamental interaction with metal. A Coinshot can Push any metal weapon away from an attacker, and a Lurcher can Pull it out of their hand. Glass and obsidian are invisible to Allomantic detection and immune to Pushes and Pulls. For Mistborn fighting other Allomancers, glass daggers are essential — the only reliable close-combat weapon. Vin and Kelsier carry them as standard equipment, drawing glass when metal weapons would be turned against them. The fragility of glass means that every strike must be precise; there are no second chances with a weapon that might shatter on impact.
Sleek, sharp blades of volcanic obsidian or specially crafted glass. They are shorter than metal daggers, with carefully shaped handles wrapped in leather or cloth. The glass edge is razor-sharp but brittle — capable of devastating cuts but prone to chipping on bone or armor. They gleam darkly, nearly black.
Also known as: obsidian daggers, glass knives