Wedding Mask of Paskari and Dormos

''The haunting, yet beautiful music that accompanied the festival echoed through the streets and gardens. The light of the twin full moons illuminated the celebrants as they went carefree about the grounds cheering on the first union of both celestial bodies after several hundred years. The ethereal haze that accompanied them all shifted in color, ranging in hues of blue and red and everything together or in between. Somehow nothing went wrong and everyone enjoyed themselves. The powers outside and below, took note of this and made sure that would never be the case again, and the moons were now powerless to stop this.''

Wonderous Item, requires attunement
Under a full moon, the wearer may cast Invisibility as a second level spell using the mask as a material component at will without expending a spell slot. Under a double full moon, the wearer may cast Greater Invisibility at will as a 4th level spell. You also gain truesight out to 120ft.

Legendary
A wedding mask like this is an extreme rarity from a Pre-Blight festival that celebrated the first time the moons were both full on the same night. There were very few of them made, and even fewer survived. They're rumored to have special powers granted to them by the strange energies of that night.