After BB arrived at 12 star, the blue umbrella cover was changed. That is, the Qibao umbrella surface has changed from the primary form to the intermediate form. Notice that there is no colorful umbrella cover, only Qibao umbrella cover and colorful umbrella cover. Qibao umbrella covers were exchanged for fairy jade and ancient jade with five red umbrellas and two thousand-year-old grass plants, and 12 or 18 stars were replaced with intermediate or advanced forms. The effect of mutation is that BB changes color and pattern, which belongs to non-attribute addition. Eat a mutation, and then eat another one to change back. Colorful umbrella covers changed it from intermediate to advanced in BB 18.