|Spoiler warning: Contains plot elements from Curse of the Mistwraith.|
s'Ffalenn is the name of the royal line which rules the High Kingdom of Rathain. During the invasion of the Mistwraith, some s'Ffalenn members fled into exile through a Worldsend gate to the world of Dascen Elur where they ruled the lands of Karthan as the Pirate Kings.
Following the death of his father, Avar s'Ffalenn, during a sea battle, Arithon becomes the sole living member of the royal line. It is revealed in Curse of the Mistwraith that the royal lines are irreplaceable because of geas wards set by the Fellowship of Seven to "ensure fair rule through generations of dynastic succession". The gifted geas of the s'Ffalenn line is compassion.