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The Lantern is the item Daniel has a the start of the game Amnesia: The Dark Descent. The lamp will provide him from light but it does require Oil. When the Lantern is out of oil it won't provide Daniel from light anymore, and thereby his sanity will drain. It has not been announced if there will be a Lantern in Amnesia: A Machine for Pigs, but it is very likely there will be one.