Soul Calibur (Umbrella Sword) is Setsuka's ultimate weapon in Soulcalibur IV and Soulcalibur: Broken Destiny. Setsuka having a form of Soul Calibur might be a reference to the fact that Mitsurugi, a man that Setsuka wants to kill, has a form of Soul Edge. However, Mitsurugi no longer has a form of Soul Edge in Soulcalibur IV.