This is actualy a weak point for goku, as oryx has been exterminating life in the universe on a mass scale for at minimum over 300 million years. And to give scale he has been said to kill species in the billions(as in billions of species) and destrpy or take whole planets, severley limiting the ammount of energy goku can use to make said bomb, not to mention it takes alot of his concentration, and needs time to charge. (About 17 episodes) most entities in the destiny universe who share his god status would kill him easily. [spoiler]the exception being crota, cause hes weak as F [/spoiler]