The Non-Canon Expert explains why so many Sith Lords suffered extreme physical deformity through their use of the dark side, looking at the words and understanding of this phenomenon among Sith Lords such as Darth Revan, Darth Bane, and Darth Plagueis. This is a Legends story regarding the Sith and dark side with information primarily found within the three novels comprising the Darth Bane trilogy and the novel «Darth Plagueis.» I hope that you enjoy it!