^ "Even if you fight Gaunter and "exile" him, it's said that it isn't a permanent solution. You can't kill him, you can't really defeat him...all you did was beat him in the "game" " Correction - Actually, he is beaten at his own game, he was defeated in those senses, it counts and beating and defeating him, but he cannot be killed in a way as we know it. As you went through the story, you learn from the blind man that one can defeat him as it was done before once, so it means you can defeat him, but he will return at some other time, which is unknown when or how, but it means you can't kill him.
He is basically The Devil as we know.