In The Wheel of Time
, Forsaken are the 13 most powerful channelers that went over to the Shadow
during the Age of Legends
. Their soul
s are so black that some people think the golden rule "no man can walk so long in the Shadow that he can not come back to the Light" does not apply to them.
Forsaken call themselves the Chosen, and make their servants do so also. They are very thirsty of power and not so enthuastic about having to share it with the 12 other Forsaken, which is why they plot against each other as much as against the world, and while even they fear Dark One enough not to kill each other (at least obviously), they wouldn't mourn seeing the others dead.
Lately, Rand al'Thor with his friends has been exterminating the Forsaken with nice speed. Luckily, Dark One has been resurrecting them at (almost) equal speed, or so it is suspected