Magus

    Known as the  Evil Prince of Darkness from 600 A.D., Magus controlled monsters to make war to the humans. He has killed many Guardia Knights and one of them was the legendary Knight Cyrus.He was also the one who transformed Frog into what he was today. He was  thought by Crono and his group to be the creator of Lavos.
    Magus was actually an enlightened child (Janus) from the Magical Kingdom of Zeal (12000 B.C.) who was separated with his sister Schala and mother Queen Zeal by Lavos and was transported to the future. He grew up in 600 A.D. with the guide of Ozzie and honed his powers from the darkness to get his revenge someday. He then was able to use his dark magic to bring Lavos from 12000 B.C. to 600 A.D. and destroy him. Unfortunately, he didn't succeed due to the interruption of Crono and his group. When he was defeated, the portal he created sucked them all and brought him to 12000 B.C.
     Magus, returning to his original home, disguised himself as a prophet to stop her mother (who was possessed by Lavos)  with her dark plans of taking Lavos' powers. On the moment of awakening, Magus reveals his true self  but was defeated by the queen. Realizing that he cannot stop Lavos by himself, he joins his past enemies to  help revive Crono whom he thinks was stupid to kill himself for his friends.
     With his great power, Magus doesn't need the help of others to destroy enemies in just one blow. He became a powerful, helpful and cold ally to Crono but besides destroying Lavos, finding her lost sister Schala was the only two things he want to achieve during his journey with them.