Thread:Emeraldblade95/@comment-39531022-20191015151954/@comment-26083398-20191017233311

To answer your question, here is an explanation of what she does in the series:

In Soul Edge, she tracks down Soul Edge to a port in Spain and confronts the undead pirate Cervantes, the two of them battle to determine the fate of the world, with Sophitia intially having the upperhand until a broken shard from the cursed sword inhales her in the chest leaving her seriously injured. Just before Cervantes has the chance to kill her, Taki joins the battle and the two of them manage to destroy the larger of the two swords Cervantes is carrying.

Believing she has saved the world, she returns to Athens, only to learn that the sword was not completely destroyed in Soulcalibur and Soulcalibur VI (which is in fact set during the second games' events albeit in an alternate universe). Hespheastus tasks her to track down the new source of Soul Edge:  Nightmare and destroy him before he unleashes the Evil Seed, which would destroy the world. Along the way, she encounters malfested (humans consumed by the cursed swords' influence with insane, murderous,  and destructive personalities), and battles them, using a special power she was blessed with by Hespheastus, she revives them to their former self. She later uses this power to "save" Seigfried, who thanks her and announces that he must be the one who must destroy Soul Edge instead of her (likely realizing that she was incapable of performing the task as she had the shard of Soul Edge stuck in her body).

During that time, she marries her fiance Rothion and the two of them have two children:  Patrokolos Alexander, and Pyrrha Alexandra. However due to complications likely associated from Soul Edge, the two of them begin fighting each other in there childhood. To stop this behavior, Sophitia embarks ona third journey to track down Soul Edge and destroy it for good, despite Seigfried's previous warning.

Eventually, Sophitia made her way to Ostrheinsburg, but before she had a chance to destroy the cursed sword, she learn two horrible truths:  One, her daughter Pyrrha was kidnapped by a servant of the cursed sword named Tira; and Two, Soul Edge was in fact the life essence of Pyrrha, and if it were destroyed, she would die. Soul Edge then manipulates Sophitia, causing her to suddenly shift sides, instead of destroying Soul Edge, she was forced to protect it if her daughter was to remain safe and alive. The sword also tasks her to destory Soul Calibur, which was the only real threat to the cursed sword.

Eventually, Sophitia does get the chance to destroy Soul Calibur after defeating the hero king Algol, but hestitates to do so after realizing should Sou lCalibur be destroyed, Soul Edge would be indestructable and immortal (almost like a god in a sense). Soul Edge, realizing this weakness, begins to consume her soul and body, but Algol manages to save her in time, telling her that she must return to her daughter and protect her with her life, whilst he preserved both swords so that no futher harm would be done to the world.

By Soulcalibur V, Sophitia is revealed to have died, and Siegfried as managed to kill Nightmare, but because Soul Edge remained intact in the Astral Chaos, a new Nightmare rises seventeen years later.

The Soulcalibur VI incarnation of her is set in an alernate timeline, and at the moment has not faced the events leading up to her manipulate in Soulcalibur IV.

You can read more about her biography on her page, as well as the ones on Soulcalibur Wiki.