Level 46 - Night Terror

 

Night Terror is the secret final boss in Soulcalibur III and can only be accessed by following a certain path in the story mode Tales of Souls while fulfilling certain requirements, such as not losing a single match. Night Terror is not an unlockable character, though he is playable through certain cheat devices. Defeating him unlocks his profile and concept art. He also has his own mission in the Missions mode, known as "Final Battle", where the player can confront him without having to go through Tales of Souls.

 

 

Source: soulcalibur.wikia.com
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