How do you unlock feral chaos in dissdia 012?

To unlock Feral Chaos in Dissidia 012: Duodecim Final Fantasy, you must first complete the main story mode and then clear the game's requirements for unlocking him. Specifically, you need to defeat Feral Chaos in the "Chaos" storyline and then complete the game's requirements for the "Trial" mode. Once you have done this, Feral Chaos will become available for you to use in battles.