I'm having a tough time at this part too, Vaan, Fran, and Balthier are LVL10 with Basch and Ashe at Lvl.11. Thjis place is too haird when the alarm sounds way too many of those guards show up and I end up being killed, on my second, 3rd, 4th, and 5th try I ran away from most of them and I came to the place where you can reset the alarm, but it's only for 60 seconds and when I make it to the boss I get crushed badly. I really need some help.