Goku fires the 10x Kamehameha directly at the opponent's chest. Then, while the beam is blasting the enemy, Goku flies through the attack and punches the opponent in their stomach with the Dragon Fist. Finally, Goku charges more power into the attack, resulting in the golden dragon overpowering the opponent as it coils around them and pierces through their stomach, inflicting a huge amount of damage.
Goku uses this attack during his battle against Omega Shenron. After Goku recovers his sense of sight, Omega Shenron still believes Goku is blind and even taunts him by allowing him to attack. At that moment, Goku fools Omega Shenron by suddenly opening his eyes and attacking him with the Dragon Hammer, seemingly destroying the Shadow Dragon. However, the victory is short-lived, as Omega Shenron survives by regenerating himself using Rage Shenron's technique, Electric Slime Body Built and continues the fight.
Video Game Appearances
The Dragon Hammer appears in Dragon Ball Z: Dokkan Battle as Super Full Power Saiyan 4 Goku's super attack. Like most Dragon Fist variations, it is simply called Dragon Fist, though uniquely, despite its animation starting with a 10x Kamehameha, it is not classified as an energy-based attack, presumably due to the emphasis on the Dragon Fist.