To perform it, he steps back and puts his hand forward and charges a purple energy sphere. Then, he fires the energy sphere in the form of a small energy wave at the opponent, inflicting a great amount of damage.
Usage and Power
King Vegeta uses this attack in one of Frieza's flashbacks to execute a Saiyan messenger as punishment for failing to capture planet Tazba on time due to the full moon being three days away. King Vegeta is also seen using the Execution Beam in one of Paragus' flashbacks to order the latter's execution along with his son Broly.