Starting out the list is the feared Separatist leader General Grievous. The only non-Force sensitive on the list, Grievous's skill comes from his previous life and his uniquely formed cyborg body. As a Kaleesh, Grievous came from a warlike planet, and it was there that he cut his teeth in
combat. After being converted to his terrifying cyborg form, his abilities only grew.
While he generally gets his butt kicked up and down in Revenge of the Sith, in The Clone Wars, he demonstrates just how dangerous four lightsabers at once can be. He holds his own against other talented duelists like Mace Windu, Kit Fisto, and even Obi-Wan Kenobi before their climactic duel on Utapau. Ultimately, Obi-Wan's defensive style wins out, easily dismantling Grievous in their final encounter.