Exar Kun from Most Powerful Sith Lords of All Time

Exar Kun was a promising Force Sensitive who was put under the mentorship of the Jedi Master, Vodo-Sios Baas, and was trained on Dantooine along with Crado and Sylyar. Kun was driven by incredible ambition to become a great Jedi and frequently dueled with his fellow students to hone his skills. This led to him deciding to study Sith history and knowledge on his own. It was through these studies that Kun learned of Freedon Nadd, a Jedi turned Sith Lord. However, his master caught him with the holocron containing this knowledge and reprimanded him. Baas eventually had Kun face Crado and Sylvar in lightsaber duels and he easily defeated the former. As Kun started fighting the latter, he began taunting her about her heritage, but this earned him a clawed slash across the face.