Soul Nomad PS2

Long ago an evil overlord wreaked havoc upon the world with its 3 demon golems. Entire kingdoms and countries were wiped out with their amazing powers. When all seemed to be doomed a powerful wizard sealed the overlord into a dark sword. Without its master, the 3 demon golem stood motionless like statue for centuries. But, now the 3 golems are active again and threatening peace. You must make a decision, sell your soul to the evil overlord or face the ultimate God of destruction without any help.

Every time when the evil overlord grants you power the less control you have over your own body. The good news is you could become stronger than the last boss from the very beginning of the game.