Darth Cognus had a complex and intriguing relationship with her Sith Master, Darth Bane. At first, Cognus was tasked with tracking down and capturing Bane, which she accomplished with great success. However, she soon realized that Bane’s vast knowledge and power could prove to be quite beneficial for her own advancement as a Sith Lord. As a result, she willingly entered into his apprenticeship to gain mastery over the Dark Side of the Force. And over the years, she proved to be Bane’s most trusted advisor.  Although she did join Darth Zannah after she defeated Darth Bane, she remained true to the ideals of her former master.