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The Echani are a group that teach hand to hand as well as a variety of weapons. However only to those who join them. The Mandalorians are also like this. However it is easier to join a Mandalorian clan and Mandalorians teach a mixture of several martial arts including Echani. There are others like the Zeison Sha but the best hand to hand fighters are thos trained in the arts of Teras Kasi. A Teras Kasi master is able to in most cases defeat a force sensitive individual, be it Jedi or Sith, in hand to hand combat.