The user charges dark energy into their right palm and launches an energy uppercut then creates an large Energy Sphere which they then fire at the opponent. Connecting a solid hit with the uppercut makes it easier to hit the opponent with the following Energy Sphere though it is possible to fire the energy sphere and still miss the opponent.
Appearance in games
Serious Bomb first appeared in and was named in Dragon Ball: Xenoverse. It appears as Mira's personal Ultimate Skill (as most of his other Ultimate Skills were originally created by other fighters like Cell, Raditz, and Omega Shenron) though it is described in-game as being as-of-yet incomplete technique indicating that Mira has yet to perfect it. It appears as his Ultimate Skill in his fourth skillset and is part of the GT Pack 2 DLC. It can also be obtained by the Future Warrior as a reward in DLC Parallel Quest Event: "Insidious Plot".
In Dragon Ball Xenoverse 2, it returns as one of Mira's Ultimate Skills and can also be used by an unplayable version of Turles that appears in Expert Quest 05: "The Galactic Tyrant". It can be obtained by the Future Warrior (Xenoverse 2) by purchasing it from the Skill Shop in Conton City for 100,000 Zeni after defeating Mira (Final Form) in the main story.