Darth Vader into his relationship with Obi-Wan and depict how their relationship matured. Ahsoka and Anakin's relationship was seen as an essential story arc spanning both the animated film and "Clone Wars" television series. Filoni began thinking about the final confrontation between Ahsoka and Vader ever since he created the former; different iterations had different endings, including one in which Vader kills Ahsoka just as she slashes open his helmet to reveal Vader's scarred face. Ahsoka's presence in "Star Wars Rebels" was necessary to allow Darth Vader to encounter the show's lead characters without the latter being "destroyed"; Ahsoka can "stand toe-to-toe"
Star Wars: Episode III – Revenge of the Sith state to fight a Sith Lord. These are a few examples of many descriptions of characters' feelings and inner narrative. There are even some humorous lines added in, including extra dialogue in the battle between Grievous and Obi Wan - Grievous says, "I was trained by Count Dooku," and Obi-Wan replies, "What a coincidence; I trained the man who killed him." An official prequel novel, "Labyrinth of Evil" () by James Luceno, was published in 2005. It is set near the end of the Clone Wars and directly before the events of "Star Wars: Episode III Revenge of the Sith".