One day inexplicable mysterious and magical objects appeared from nowhere through in all the planet, causing curiosity between people.
This objects were later mamed the transformation treasures, due their particular properties of transforming people, this objects could look like a shirt, pair of earrings, piercings, bracelets and way more accessories.
The powers of this items have been studied deeply and an actual classification of them has been made, varying from:
Creature treasures: the carrier of this kind of object can transform at will completely or partially into the creature the treasure represents, varying from animals, mythological beings or monsters. For example there a person wearing a tiger collar can transform themselves into a fully feral tiger, anthropomorphic tiger or just transforming some parts like growing tiger claws and fur.
Inanimate treasure: similar to the creature treasures, the carrier can transform at will completely or partially into the inanimate thing the treasure represents.
Special treasure: this is a completely other kind to the other two, since these treasure don't actually transform the carrier into something, more like they give their user a power related to transformation, like merging with others, shrink or grow, change their gender or age, and an infinity amount of different types.
Side note: a person can wear more than one treasure and combine their powers at their will, there was a woman on the news who had some kind of bee scarf and a special gender changer bandana, transforming herself into an anthropomorphic shemale queen bee, and hasn't been found since that. The carrier can also make their treasures invisible to hide them and get rid of possible suspicions, the treasures also turn invisible by default after the owner transforms.
This kind of powers could result in a catastrophe I'm the wrong hands due their strong potential in weird people desires, that's why the majority of treasures has been kept in museums and is rumoured that big companies have them hidden too. Finding a secret treasure is a complete mystery since they can appear from the depths of the ocean to a random house, also is rare to find them randomly, but not impossible.