Peter and Max: A Fables Novel
By Bill Willingham
Max grew jealous of this and eventually went insane, to top that off he was given a powerful flute of his own named Fire. Fire could bend the will of anything, including humans. Max used this to advantage and became known as the Pied Piper of Hamelin who stole the children away from the city to torment the officials.
Eventually the two brothers have a showdown in our world and it becomes the sibling rivalry of a lifetime.