Voldemort is an especially frightening and well-cast enemy figure because he is no longer human, and therefore not subject to the limitations of natural human laws. He can feed off of people and return, or let his belongings fall into unknowing hands and still return. Perhaps the greatest advantage possessed by Voldemort (Riddle) was foresight. Before his strength was diminished by the infant Harry, he had set his affairs in order so that he could return in a number of different ways. This makes him threatening, the most difficult possible challenge to fight in a series such as this. Harry is required to act especially resourcefully, as he did when he stabbed the fang into the center of the diary, in order to combat this multi-faceted enemy creature.