Maulkiller
Maulkiller is a hybrid clone created on the planet Kamino by Darth Vader , a Sith lord. Maulkiller was created by combining DNA from the Zabrak Darth Maul and the human Galen Marek. He attacked Imperial targets, until Boba Fett shot him in the back, who was hired by vader.
During his life, Maulkiller struck fear into those who crossed him, including Vader. He has silver skin with black tattoos, and two black lightsabers.