Stardust Breaker (Rainbow Sparkling Blast, Soul Punisher) is the technique that Gogeta used to kill Janemba.
Gogeta first catches his opponent off guard then he puts one hand in the air and forms a baseball-sized rainbow-colored energy ball. When Gogeta throws it at the target it has a delayed effect, but finally disintegrates the target to glittery gold dust. This move destroyed all the evil that Janemba was made of and restored the tank boy Saike back to his former self. This attack can be seen in Dragon Ball Z: Budokai 3 and the Budokai Tenkaichi series. This is his special attack in Dragonball Z: Budokai 3 and in the Budokai Tenkaichi series, this attack is his Ultimate Blast, and inflicts great damage. It is also one of Gogeta's own moves.