Maladian

The Maladians were a cult of highly-skilled humanoid assassins from the Maladi system known to honor all their contracts, as well as being able to wound or kill Jedi Knights. In 52 BBY, the Sith Lord Darth Sidious, along with his aide Sate Pestage, had a Maladian assassin kill the Chommell sector's Senator Vidar Kim on the galactic capital world of Coruscant. Later that year on Coruscant, around three dozen Maladians were contracted by Gran Senator Pax Teem and other Grans to kill the important Muun Hego Damask, who was secretly both the Sith Lord Darth Plagueis and Palpatine's Sith Master. However, the Maladians failed in the attempt on the Muun's life, after Plagueis managed to hold off the assassins long enough for Palpatine and Pestage to arrive in order to save him. Plagueis was nearly killed by the encounter, and was forced to wear a respirator for the rest of his life following the event.

Text and facts from the “Maladian” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.