The Mask of Sliske, Light, also known as Light, is a sentient mask that is involved in the Missing, Presumed Death quest, and features as a reward.
Light is first encountered during the quest, where it is guarding the Light Chamber in the Empyrean Citadel for its master Sliske with its "friend", Shadow. Light is very cheerful, and seemingly oblivious to how much Shadow hates him, though he acknowledges how grumpy Shadow is. He is happy to allow you to pass after you complete the puzzle.
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 Shadow. If lost, it can be reclaimed from the Statue of Death in the citadel. On reclaiming it will be removed from your inventory, bank, equipment or even keepsake box if you had one already.
Light has a "Talk to" option. This will cause the mask to say one of the following lines:
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