Darth Vader is an incredibly powerful Sith. He has killed countless Jedi and mastered both the dark and light side of the Force, yet Obi-Wan Kenobi proves that Darth Vader is still and always will be an apprentice. He went from being a pawn of the Jedi Order, fighting the Republic's wars, to being the pawn of the Empire, having no more respect than a common admiral. He has struggled his whole life for power, and when he finally achieves some, it's reduced to nothing by someone even more powerful.
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