OC: Rina the skeleton detective

Rina is from the underworld where skeletons rule. She is a famous detective skeletons who solves cases like head and bone stealing. She is ranked high in the bone kingdom. She also has done a few cases on earth. One way to summon her throught chanting very loudly Latin. However, it is a specfic words that will bring her back. And even then she can only spend one month on earth before she has go to the underworld again.