In first room where you are split into 2 groups, save ants for last and kill at same time as other group. Next room, your 2 groups will now be back together. Kill sentries (big ants) last, unsure if they need to die at same time (we always kill them together). Do this for another 1 or 2 rooms, then you will eventually take a port to a hallway with no mobs, 2 treasure chests and the brd/war af boxes. The next port leads to princess.