Double-click to reveal the true nature of a nearby raven.
— In-game description
Subtle Spyglass is part of the Nevermore III: The Raven Staff collection and is used with Spirit Containment Unit to progress that collection. It can be safely discarded once the collection has been completed.
- Likely a reference to The Amber Spyglass book by Philip Pullman. The icon is very similar to the book cover of The Amber Spyglass, the recipe contains Ambrite (Amber), and "Subtle" is used in the title of the previous book in the series, The Subtle Knife.