Wondrous Item, uncommon (requires attunement by a The Artificer who made the Unicorn-Horned Helmet must show its wielder how to activate it.)
Once per long rest, the wielder can cast Sanctuary. Sanctuary can be cast additional times at the cost of the wielder's spell slot. Only one creature can benefit from the caster's Sanctuary at one time.
While equipped, the helmet adds +1 AC.
Notes: Bonus: Armor Class, The Artificer who made the Unicorn-Horned Helmet must show its wielder how to activate it.