I beat the game a while ago and on korribon when you go in to the tomb and face your past you see Kreia. When I walk up to her my party members come and attack her you have the option to help her. If I attack her I can go on but I get a dark side boost. But if I help her and kill my party members disapear and the door to progress is locked but if I talk to Kreia the whole conversation starts all over. So I have to take the dark side boost. Why?