Shenron

Shenron is a magical dragon born from the Dragon Balls created by the original guardian of the Earth. When all seven Dragon Balls are gathered together, Shenron comes forth and grants the user a single wish. When the wish is granted, the Dragon Balls scather across the Earth to find new locations where it will accumulate enough power to be active again. However, when the Dragon Balls were used more than once, they become cracked and negative energy will be released thus forming the evil counterpart of Shenron called, Black Smoke Shenron and seven other dragons called the Shadow Dragons.