Ray Blast (レイブラスト Rei Burasuto) is an Explosive Wave and is Kefla's ultimate technique. According to Vados, this move can be considered a true final weapon to settle a fight because of its destructive power and massive range.
To perform this technique Kefla powers up her aura to maximum capacity and releases it continuously in several laser-like beams, which are omnidirectional. The beams' cutting power is great enough to slice the debris of the ring of Tournament of Power easily. After the first release, Kefla can aim the beams manually. The beams are extremely fast, even for Goku in his Ultra Instinct -Sign- state who was able to barely dodge them; They were also so powerful that it has been stated that not even Goku in his Ultra Instinct -Sign- state would've been able to survive if he was hit by one of the beams. The technique can even be further powered up, with the beams taking the form of red lightning bolts. While performing this technique, Kefla can also fire energy spheres or perform her Gigantic Blast or its enhanced version, the Gigantic Burst, to support it.
In the anime version of the Tournament of Power, Kefla used this technique against Goku in his Ultra Instinct -Sign- form.
Video Game Appearances
"Shoot out 3 Ki Waves in rapid succession while safety surrounded by a barrier that stops normal Ki Blasts! After firing, input the command for an Ultimate Attack to cancel the technique and fire that attack."
— Dragon Ball Xenoverse 2 Skill description
This technique was named Ray Blast in Dragon Ball Xenoverse 2 where it appears as one of Kefla's Super Skills. In Xenoverse 2, Ray Blast is a technique that that produces a protective barrier of aura around the user as they fire three bolts of ki that fire in rapid succession while the barrier protects the user from normal ki blasts. After firing, the user can use an Ultimate Skill to cancel the technique in order to transition to said Ultimate Skill (for example Kefla can transition to either a Gigantic Burst or Full Power Energy Wave) as long as they have enough Ki making it great for combos. Gigantic Burst also starts with the user sweeping three stronger Ray Blasts forward that knock the opponent back if they connect making the rest of the attack eaiser to land. The Future Warrior can obtain it as a random reward in New Parallel Quest 125: "Proof's in the Potara".