Soul Calibur (Final Form) is Siegfried's strongest weapon in Soulcalibur IV. It can be bought in Character Creation for 30,000 Gold after completing Story Mode with Siegfried. It has Nullify Aerial Control equipped by default as a skill, which prevents opponents from gaining aerial control until the character is attacked three times in the air. Purchasing this weapon also unlocks an Achievement/Honor. It is used by Siegfried if he is fought in Story mode as the final boss.