Ah, yes, looking at that you do get to search for and place those. It’s “may”, so it’s up to the group. You are probably not strong enough to fight the level 1 boss, let alone the level 4 and 5 bosses, so you might not want to. Then again, if they’re placed you know where they are and the Ravager has more room to move when it shows up. (Which it only has a 25% chance of doing this turn.)