Agatha's Mask

A solid white mask made of polished stone.  If the mask is placed over the face, the appearance of the wearer's body will change to the form chosen by the wearer, and the mask will be be absorbed into the wearer's body.  The color of the skin and hair will be changed, and facial features will be altered to appear as the chosen race.  The clothes and any objects worn or held are unchanged.  The effect can't be dispelled and only ends when the mask is removed as a magic action.  The effect is not illusory, and magic will not reveal that the form has been altered, but the presence of the mask can be discerned by subtle clues with a DC20 Intelligence (Arcana) or (Investigation) check.