Star Wars: Enemy of the Republic - Dark Side
Dass Coven was a Jedi Master that managed to avoid Order 66 due to his mastery of Force Illusions. After escaping, he set out to find a safe location to hide while he regrouped with other Jedi and tried to strike back against the Empire and the Sith.
He managed to escape to Telos IV where he found the ruins of an ancient academy that had long been abandoned. He gathered a few stray Jedi there, but was never able to build a sizable group. Using his powers of illusion and some carefully applied mind tricks, he managed to convince the few beings that found the ruins that they were still abandoned, and unsafe to enter.
Despite all his precautions, he and his group were eventually discovered by the Sith and mercilessly slaughtered.