One of the most important moments in all of Star Wars comes in A New Hope when Darth Vader kills his former master Obi-Wan Kenobi, but one theory sees the moment as the beginning of Anakin ...

Darth Bane and Darth Revan both hide their faces ... To lesser powers, his mask is the face of Death. To other Sith Lords, his ceaseless hunger threatened to consume their power.