Amber Spyglass

While looking through it, you can cast Detect Magic spell at will. (For the duration, you sense the presence of magic within 30 feet of you. If you sense magic in this way, you can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any. The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.) Has 4 charges. Regains all expended charges daily at dawn. As an action, you can speak the command word "Peekaboo!" and expend 1 charge. For the next 10 minutes, you have truesight out to 120 feet when you peer through the spyglass. (Truesight: A creature with truesight can, out to a specific range, see in normal and magical darkness, see invisible creatures and objects, automatically detect visual illusions and succeed on saving throws against them, and perceives the original form of a shapechanger or a creature that is transformed by magic. Furthermore, the creature can see into the Ethereal Plane.)