Syn Shenron

Syn Shenron is the One-Star Shadow Dragon, born from the accumulated negative energy of all the wishes ever made on Earth's Dragon Balls. He is the most powerful of the seven Shadow Dragons and serves as Dragon Ball GT's final villain. After absorbing the Dragon Balls of the other Shadow Dragons, he transforms into the cataclysmic Omega Shenron, gaining access to all their abilities simultaneously. He required Goku and Vegeta to fuse into Super Saiyan 4 Gogeta to have any hope of matching his power.