Forkroot

Forkroot is an herb, which probably grows in Amadicia, among other places. It has the unusual property, when it is brewed into a tea, of suppressing the ability to channel. A woman(it is unknown whether it works on male channelers as well)who drinks forkroot tea will find herself unable to reach the True Source. It also causes physical effects, making it hard to move and talk, or even causing unconsciousness in sufficient dose.