From A Wiki of Ice and Fire
Arya's target bites the poisoned coin. Illustrated by Paul Guzenko, © Fantasy Flight Games
|Book(s)||A Dance with Dragons (appears)|
A Dance with Dragons
Arya Stark is tasked by the kindly man with assassinating him, forbidding her from killing the guards. Arya kills him by slipping a poisoned coin into the purse of one his clients, as the man always bites coins to test if they are legitimate.