How about a haunted long lost space craft in the outer rims. Imps and republic want to find out what happened there. No power in the ship no lights, lots of puzzled, and moaning/groaning from some lost long ago sith lord bent on revenge, toss in some droids creepy music and smoke. If you come as a group you are all split up to wonder the maze that is the ship. Some force levitating ship parts. Some blood on the walls, a new model of creepy space monster. classic scarey, stuff jumping from around corners, scary music.
At the end you ghost bust the sith lord trap him in a datacron, did someone call ghost busters?
Bam haunted house SWTOR style