Kronos

Kronos is an evil titan ruler. He is the main villain in the series. Kronos eats his kids, but Zeus kills him, frees his brothers and sisters, chops Kronos up into millions of pieces, and banishes him into the Pit of Tartas. Kronos is one of the most devastating gods, and one of the most evil ones as well. In the book, Kronos takes over a kids body to incubate his powers. When he gets ready he with disinigrate the body he is using and go into his true form, which is bad because if you look at his true form (as with all the other gods) you will burn up. A god said that he is so strong that just his presence will turn mortals into ash. That means he is unstoppable. But I'll spoil the ending a little by saying that he is defeated (I won't tell you that part, you'll have to read to find out!) before he turns into his true form.