Darth Maul was a weapon forged by the hateful energies of the dark side to ensure the victory of the Sith over the Jedi order. A creature of pure evil, Maul had no personality beyond his ultimate devotion to his master, Darth Sidious. His goal was singular -- to exact vengeance upon the Jedi for the decimation of the Sith ranks.
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From starwars.com