Silks are brutally skilled and quick Silvers. Unlike the others, silks do not possess supernatural abilities and are instead gifted with enhanced agility and perfect balance. Silks are known for being quick and quiet and vicious in a fight. Mare described silks as catlike with lithe movements. Like shadows, they are often spies.
"Silks are perceptors, naturally skilled in their own bodies, their abilities tied to enhanced agility, speed, and coordination. With training, most silks are formidable warriors as well as valued spies. The last few decades of the war between Norta and the Lakelands relied heavily on silk spies from both nations. House Iral of Norta is considered the most elite family of such ability, currently headed by the famed, Panther, Ara Iral." -Victoria Aveyard "War Storm" "On Silverblooded Abilities"