We All Wear Masks: Faces of the Grotesque (Patreon)

This collection of five magical masks, fashioned out of a monstrous creature's visage, imbue 5E characters with the powers of the monsters they depict. Each mask has a history, powers, plot hooks, and curses and drawbacks -- the Goblin Mask, Mask of the Dragon, Dire Bear Mask, Hill Giant Mask, and Octopoid Mask.