While using Ray Blast, Kefla charges a much powerful Gigantic Blast and fires it at her opponent. When charging it, the energy spheres mix up forming a spinning disc of Ki in each hand before thrusting her arms forward and finring two massive spiraling red and green energy waves.
Kefla confidently used the Gigantic Burst during the climax of her fight with Ultra Instinct -Sign- Goku, claiming that Goku would be unable to dodge her attack in the air, though Goku simply surfed on the Gigantic Burst with the Imperfect Instinct Kamehameha and blasted her off the arena, separating her back into Caulifla and Kale.
Video Game Appearances
"Fire 3 Ki Waves in a forward sweeping attack while charging ki in both hands, then crash them together to fire another Ki Wave in this spectacular Ultimate Attack!"
— Dragon Ball Xenoverse 2 Skill description
In Dragon Ball Z: Dokkan Battle, it appears as Super Saiyan 2 Kefla's super attack under the name Gigantic Blast where she hits the foe hard with a barrage of Ray Blasts before using the Gigantic Burst to blast her opponent away.