The helmet is a beautifully intricate design by some sort of reddened, hard material- it's easy to assume it's metal due to the weight, but it seems to defy this notion through texture.

Attunement to the Sphinx's Veil provides a +1 to AC, as well as raising one's INT to 17.

You also remain aware of your surroundings when asleep, and have advantage on Perception checks. Lastly, you may cast See Invisibility once per day.

Notes: Set: Intelligence Score, Bonus: Armor Class, Advantage: Perception, Attunement by one touched by the Baron