As a miscellaneous gear token, the use of this item in the adventure is limited only by the imagination of the player and the approval of the DM.
When unstoppered underwater, this item causes an inky cloud to fill a 10′ cubic area which lasts for the duration of the room. It effectively renders all characters and monsters in the area obscured from ranged attacks. The effect of this item reduces the To Hit chance for both player and monster via a targeted ranged attack.