I had my first experience in this dungeon last night and sadly not with my FC. Thankfully the players I got in duty roulette explained everything, yet they ran all around. I was nervous as hell, firstly because I play a dragoon, second I am completely new to game. It was fun. From what I have read here, my experience was quite different on last boss. I was actually told to LB the bomb, not the boss. So as soon as that huge bomb appeared I did and then we killed the guy and everyone went home happy.