The Emperor's Machinations Revealed Boba Fett tells Darth Vader that the rebel pilot he's after is called "Skywalker." Thus revealing to Vader, for the first time in the new canon, that he has a son and that the Emperor lied to him about Padme's death.
Book I: Vader, Part Vi Synopsis for "Book I: Vader, Part VI"
Disorder engulfs the galaxy. After the destruction of the DEATH STAR by a mysterious Force-strong rebel pilot, the Sith Lord DARTH VADER was deemed responsible by his master, Emperor Palpatine. Now pursuing his own agenda, Vader enlisted his own assistance—the bounty hunter BOBA FETT and archaeologist DOCTOR APHRA.
With a newly acquired droid army, Darth Vader stormed a secluded stronghold in the Outer Rim where a technology specialist named Cylo has been secretly working for Palpatine creating lightsaber- wielding cyborgs.
Now in the presence of the Emperor himself, Lord Vader must fight for both his honor and his life against Cylo's team of technically enhanced warriors....