Darth Bale, born as Cialla Santane on Nar Shaddaa, was a Sith-Lady and the successor of Anakin Skywalker/Darth Vader as Palpatines Sith apprentice. Before she became a Sith, she was a pirate captain and Dark Jedi, trained by the Kiffar Taran Del, who was a Dark Jedi himself and a secret ally of Darth Sidious. She was bound to Anakin Skywalker by a Force bond, which allowed her to know, what he was thinking or feeling. This bond was the reason why Palpatine choose her as his Sith apprentice.