A strange lense commonly carried by guardsmen to ward off ambushes and traps. Its method of doing this is unknown, however its effectiveness is sworn by in the guardsman business.
The Prismatic Watchman's Shard is the Gem to help avoid wound traps, that add to the Characters Wound Counter,
It is not guaranteed to work; instead after being "caught" by the trap, a second roll is made. For this second roll, you have a 10% chance to avoid damage from a trap. Note that the Shard has no effect upon traps that do not affect your health (wounds).