The Non-Canon Expert explains how Darth Sidious motivated his apprentice Darth Vader to carry out a mission for the Dark Lord of the Sith one year before the Battle of Yavin, telling Vader that a Force user that needed to be hunted down may be the child of a former Jedi, or even the child of Anakin Skywalker himself! This is a Legends story for Darth Vader that can be found in the Legends comic «Star Wars: Empire» within the «Betrayal» arc. I hope that you enjoy it!