Gigantic Blast is an energy sphere barrage used by Kefla in either her Super Saiyan or Super Saiyan 2 forms.
Overview
The Gigantic Blast when used as a Super Saiyan 2.
This technique can be performed in a variety of ways. Kefla usually creates multiple green or red energy spheres on top of her hands and throws them at her opponent. However, Kefla can maneuver these spheres to do various things with further use of ki control. Such as focusing them into one huge energy sphere, or make all of them come up and shower the opponent filled with the blasts.
Kefla uses this technique against Ultra Instinct "Omen" Goku several times during their battle. However, all of these attempts were dodged by Goku due to him using Ultra Instinct.
Gallery
Kefla about to use the mid air version on Goku.
The mid air version.
The energy sphere version.