Soul calibur 4 is two main battles ending, where nightmare and Siegfried fight on one side while Algol and mitsurugi on the other, the firts conclude their fight whit nightmare lost, thus interrupting the seconds fight as the destruction of soul edge also causes the end of the tower that keeps the reflection of Algol,…

Because in canon history sophitia and taki defeats Cervantes, and then they leave, then Siegfried come to find Cervantes on the ground and soul edge at his side, Cervantes then grabs the blade and becomes a flaming skull who Siegfried later defeats, the reason is so complicated is because on the game you do this two…