Cold Watchmen are located in the Echoing Library. As far as FOE are concerned they are surprisingly weak, and have highly predictable movement patterns. Most travel in straight lines, and upon reaching an intersection will turn to look down each hall before pressing on. Despite being weak, if one should see you it will sound an alarm which activates all of the Cruel Slayers in the room, quickly turning an easy fight into a struggle for survival (as the slayers move very quickly and will attempt to join the battle ASAP)