First-the Final battle or DLS Treasures of the Sun (Dungeon Siege 3)

dungeon siege 3 is that the first pass-that is, after the finale of the game is not coming back?Because writing that ran along the passages behind the main villain before the final battle, and then I wrote(if you go that Atunaisa the desert is no longer available!!!).That is, DLS!It turns out that DLS first, then gauged to beat?so?