Mask of Sliske, Shadow (Missing, Presumed Death)

The Mask of Sliske, Shadow, also known as simply Shadow, is a sentient mask that is involved in the Missing, Presumed Death quest, and features as a reward.

Shadow is first encountered during the quest, where it is guarding the Shadow Chamber in the Empyrean Citadel for its master Sliske with its companion Light, whom it hates and describes as a "brainless moron". Shadow is very grumpy and depressed, and after the puzzle is completed, begs you not to leave him there.

It is given as a reward after the quest, by Brother Samwell, and it can be worn, be spoken to while in your inventory, and switched to Light. If lost, it can be reclaimed from the Statue of Death in the citadel. Upon reclaiming, it will be removed from your inventory, bank, equipment or even keepsake box if you had one already.

The mask is upgraded after completion of the Dishonour among Thieves quest. This upgrade gives the mask, when worn, a 1 in 30 chance in combat that a wight ranger will spawn and fight for you. The mask cannot be used with Dreadnips and the wights will not appear in PvP.

Dialogue
Shadow has a "Talk to" option while in your inventory. This will cause the mask to say one of the following lines:
 * It's so dark in this bag. I quite like it, actually.
 * Can't you just leave me be?
 * What do you want now? Don't you ever stop talking?
 * Where are you taking me now? Don't you ever stay still?
 * Don't you have anything better to do?
 * Do you have any idea how terrible it is to be just a face?
 * I'm so bored.
 * I wonder what Light's doing. Probably babbling on about some utter nonsense.
 * Oh no, put me down. Please don't put me on your face!
 * I'm so glad Light isn't here. He's even more annoying than you!