The Moth Miraculous is a brooch that, whenever Nooroo inhabits it, transforms the wearer into a moth-themed superhero with the ability to give a person superpowers and make them a devoted follower of the wearer. The brooch is currently owned by Hawk Moth, and is currently being used for evil purposes—specifically, creating supervillains who attempt to steal Ladybug's and Cat Noir's Miraculouses.
When not transformed, the brooch is oval-shaped, and the front is purple. It opens up as a locket, in which an image can be placed. The edges of the brooch and the back of the front part are gray metal, some of it branching out on the outer area of the front of the brooch. When Nooroo inhabits the Miraculous, it becomes a dark purple button, with four light pink strands of fabric coming out from it, making it resemble a butterfly or moth.
The Moth Miraculous grants its wielder the ability to sense positive or negative emotions in order to precisely pinpoint a targeted person's identity. The wielder can then energize a butterfly, to be sent to possess an object of the person. Then, the Moth Miraculous holder is able to communicate with the person to offer him powers. Once they accept, they transform into super beings. In addition, the wielder can telepathically connect to the possessed person and can control the person's body to a certain extent.
However, these powers do have their limitations. Hawk Moth appears to only be able to make one akumatized villain at a time, and it seems that he must wait for some amount of time between creating villains.