"Fire countless sharp, deadly Ki Blasts over a wide range!"
Super Janemba traces his finger in the air and creates a streak of green energy light that breaks into sharp, glass-like needles (which are identified as a form of Ki Blast in Xenoverse 2). Then, he swings his arm back and fires the energy needles at his opponent, inflicting a high amount of damage.
Super Janemba uses this attack during his battle against Goku and Vegeta in the movie Dragon Ball Z: Fusion Reborn. After Super Janemba uses his Mystic Attack to stretch his arm and strangle Vegeta, Goku saves him and they both hide in a mountain of spikes. While Goku is trying to convince Vegeta to fuse together, Super Janemba attempts to murder the two Saiyans firing the Lightning Shower Rain at the spiked mountain. Fortunately, Goku and Vegeta dodge the attack with just a few cuts.
Appearances in games
Lightning Shower Rain was named in the Budokai Tenkaichi series and is one of Super Janemba's Blast 2 attacks in his super form. In Dragon Ball Z: Shin Budokai and Dragon Ball Z: Shin Budokai - Another Road, it is called Needle Mountain Hell. It is Super Janemba's super attack in Dragon Ball Z: Dokkan Battle.
In Dragon Ball: Xenoverse 2, it appears under the name Dimension Ray and is one of Super Janemba's Ultimate Skills. It is also used by Mira in story mission "Bardock, the Masked Man". It can also be obtained by the Future Warrior (Xenoverse 2) by purchasing it from the TP Medal Shop (open from Friday to Sunday) for 50 TP Medals. Interestingly, the glass-like sharps produced by this technique are identified as a type of Ki Blast that are razor sharp, thus classifying it as a unique form of Energy Barrage.