He's one of the three points which compose the triangle of the prophecy. He represents Madness.
Careless and brave, reckless and defiant, Syndag is an orphan – he doesn't know his parents and where he comes from. He arrives in Aghrem as a little kid, and the villagers immediately begin to consider him a strange boy, because he boasts that he can talk with fairies. Syndag lives for the glory, to behave as the mighty warriors he only read about, dreaming about becoming a hero.
He loves Norje, who is the only who really believes in him.