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Old Republic
an alien known to the Old Republic as a Wharl (or Tchuukthai), Thon was
in reality a sentient being who chose to keep his species and his culture a
well-guarded secret. Thon trained in the ways of the Force, and
eventually became a Jedi Master. He was assigned as the watchman of
the Stenness System, and was living and training on Ambria just prior to
the Great Sith War. When he first came to Ambria, the Dark Side of the
Force was prevalent on the planet. Master Thon pushed the Dark Side
back, forcing it into Lake Natth. His experiences on Ambria taught him of
the virtue of the Light Side, and he tried to convince other Jedi Masters
about the dangers of the Krath. He was supposed to have continued the
Jedi training of Andur Sunrider, but Andur's death changed those plans.
Instead, Thon became the teacher of Andur's wife, Nomi. Her
stubbornness was broken when Thon was attacked by Bogga the Hutt. In
the battle, Thon gave his lightsaber to Nomi, and she used it with unusual
skill for an untrained Jedi candidate. Thon realized that Nomi was the
special Jedi he was prophecied to train, and took her under his tutelage.
Later, he was part of the assembly of Jedi Masters who met on Deneba to
discuss the Krath uprising in the Empress Teta system.


Some info gathered with permission from: CUSWE
Master Thon