Star Wars comics have given Darth Vader a new Imperial title. Palpatine's plans for Anakin Skywalker were seriously disrupted when his new apprentice was defeated at Mustafar. He had devoted so much time to seducing the boy to the dark side, and he was unwilling to see all this effort wasted. And so he had Darth Vader transformed into a cyborg, and his true identity became a closely-guarded secret.
The sense of mystery meant Darth Vader was all the more terrifying. Some believed he had been created using Separatist technology — the same techniques that created General Grievous. Others speculated he was Palpatine's secret weapon, held in reserve throughout the Clone Wars in case the Jedi ever betrayed the Emperor. This theory at least accorded with rumors Darth Vader had led the clones in an attack on the Jedi Temple at the beginning of Order 66.
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Star Wars comics have given Darth Vader a new Imperial title to define his role — that of the Emperor's Fist. The designation has been used twice now, in Age of Rebellion — Darth Vader #1 and Darth Vader #24, and it's already been referenced in one novel. It perfectly describes the role Darth Vader had his apprentice play in the galaxy; he was Palpatine's enforcer, the iron fist striking out at anyone who would dare oppose the Emperor.
The title is a riff on an idea from the old Expanded Universe, where Palpatine had a number of operatives named as Emperor's Hands — most notably Mara Jade, the woman who would eventually become Luke Skywalker's wife. Both titles subtly stress the lack of autonomy, for they indicate the respective individuals were defined by their relationship to Palpatine himself. The Hands
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