An apprentice to Darth Bane since childhood, Zannah demonstrated an innate talent for the use of the Force since she was a child.

In addition to being a master of the Soresu with her double-bladed lightsaber called Bane's Heart, Zannah was extremely powerful in the use of sorcery and Sith dark magic.

Her conflicted relationship with Bane ended in Ambria where the two fought a violent and explosive duel of sword, Sith magic and Force-will with Zannah emerging victorious.

After this Zannah adopted Darth Cognus -who was present during the duel with Bane- as her apprentice thus continuing the Rule of Two imposed by Bane.

The cause, place and date of Zannah's death are unknown, although it is to be presumed that she was killed by her apprentice Darth Cognus.