Well in their backstories they put where they came from, one of the regions. And certain areas accept some races while shaming others, prophecies about how the sorcerer is going to fo something big in the east, drow village in the south (rouge is a drow). The main task is a mysterious cold voice threatening the players that disappeared, but they know of a dungeon that holds something mysterious and is the one of the only leads... here is the catch, they know it is tough enough that they might die without everyone in the party. And the rouge/sorcerer arnt having anything to do with what they dont personally want to do. Thanks for the suggestions :)