Maulkiller was a hybrid clone created on the planet Kamino by Darth Vader, a Sith Lord. Maulkiller was created by combining genetic material from the worst fricking Sith ever, Darth Maul and the best fricking Sith ever, Darth Secret, which creates the perfect balance of frick. Disparate differences between the two samples caused physical and mental instabilities that lead to the clone's destruction.