Item from acotar-mist-and-fury by
A poison that chokes magic at its source, brewed by Hybern to counter fae power.
Faebane is a weapon of the cunning and the desperate — a poison that does not kill the body but strangles the magic that runs in a faerie's blood. Brewed from rare roots and alchemical processes known only to the King of Hybern's most trusted apothecaries, it is the one substance that can make even a High Lord as helpless as a mortal child. Its use is a declaration of war, for it targets the very essence of fae existence.
A viscous, murky liquid the color of bile, often stored in thick glass vials stoppered with wax. It reeks of crushed herbs and something metallic, and when exposed to air it smokes faintly, as if it burns from within.
Also known as: Faebane, the Choking Dust, Hybern's Brew, the Silent Kill