I have a player who is an apprentice of a Jedi (now dead) that initially survived Order 66. It works well into the story so far, but I'm beginning to get concerned about how to properly keep them from showing off that they're a trained Jedi Knight. Or at least how to punish/complicate things for them if they decide to. Obviously an Inquisitor getting dispatched to assist the local ISB detachment is the first step, but if things continue I was planning to have Vader show up to end things for good or drive him back into hiding.
The Force and Destiny book has a short section saying to not stat out Vader and just have him do his thing, but I want to make him an implacable force instead of a game-breaking annoyance that pulls the players out of the game and gets them frustrated at me.
Does anyone have any suggestions on how to make him powerful enough to fear, but not so blatantly invincible as to be cheesy?