A) It was from the yatch of Jorj Car'das, who was a very sucessful smuggler. He had been injured from an encounter with a dark jedi, and healed by Yoda. He returned to Yoda for more healing, but Yoda tossed it the beckon call (along with Car'das' blaster) into the jungle, then sent Car'das away (suggesting he might seek out the Aiing-Ti monks). This is all from the Hand of Thrawn duology.
Q) What weapon used on the forearms was developed by Kar Vastor?