A dangerously addictive drug derived from processed jurda (a stimulant plant from Novyi Zem) that temporarily amplifies a Grisha's powers to extraordinary levels, granting abilities far beyond their normal scope. However, parem is devastatingly addictive from a single dose, rapidly destroying the user's body and mind. Its discovery drives much of the plot of the Six of Crows duology, as every nation seeks to control or exploit its power.