http://www.newsweek.com/how-unlock-inferno-soul-calibur-6-1177371

Inferno, the big baddie of SoulCalibur VI , is playable but must first be unlocked by players getting through one of the two story modes of Bandai Namco’s latest fighting game.

SoulCalibur fans will want to dive right into the two story modes offered in the sixth installment of the long-running series, but if you’re looking to unlock Inferno as quickly as possible, you’ll want to head over to Chronicle of Souls.