Dragon Masks

Forged in the pits of Avernus by Tiamet herself in an effort to exert more control on the mortal realm. The five dragon masks
When two or more of the dragon masks are assembled, they transform magically into the Mask of the Dragon Queen. Each mask shrinks to become the modeled head of a chromatic dragon, appearing to roar its devotion to Tiamet. Where all the masks brought together, the arrange into a  crown-like on the wearer’s head. Below the five masks, a new mask shapes itself, granting the wearer a draconic visage that covers the face, neck, and shoulders.
Some say that if all five masks where to be brought together the full power of the masks could release Tiamet from her prison and bring about a new Age of Demons.