Requires Attunement
While you are attuned to this item, you can cast see invisibility on yourself at will.
You can see normally while the Mad Eye remains in your socket, but can choose to close your other eye to see through its magically enhanced lens using a bonus action. Looking through the eye grants you darkvision of up to 120 feet, and are able to peer through both magical and nonmagical darkness using it. The eye moves slower than a normal eye, leaving slight trails and motion blurs behind it as you look through it. While looking only through the Mad Eye, you have disadvantage on any attack you make as well as ability checks that rely on depth perception. You can open your other eye and regain your normal vision using another bonus action.
The eye is a gruesome familiar. As an action, you can command the eye to crawl out of its socket and move independently of you. Use the abilities described in the find familiar spell when commanding the Mad Eye. The eye has five hit points, an AC of 12, a movement and climbing speed of 20 feet, does not require air to breathe, and has a +6 bonus to Dexterity (stealth) checks. If the eye is slain or you dismiss it, it reappears inside your open eye socket with a sickly sound. If it was slain, you cannot use its magical sight or command it as a familiar again until the following dusk.