Revan singlehandedly defeated Mandalore, turned around the broken remains of the Republic to destroy the combined might of the Mandalorian clans, kept Emperor Vitiate from invading Republic space through his willpower, redirected a powerful Sith Lord's lightning and used it to [i]vaporize[/i] said Sith Lord, and even singlehandedly defeated Darth Malak who was trained by Revan himself and was an extremely powerful duelist.