"Creates two Ki Blasts around you! They can be used for either attack or defense! Additional input will fire them towards an opponent!"
First, Slug charges two golden energy balls in his hands. Then he fires them at the opponent, inflicting a large amount of damage. Lord Slug uses this technique inside his spaceship, testing out his powers after using the Dragon Balls to wish himself back to his prime, while his henchmen are fighting the Z Fighters.
Appearances in games
"Creates two Ki Blasts around the character. Pressing the button again will fire the blasts at an opponent."
— Dragon Ball Xenoverse 2 Tutorial description
In Dragon Ball Xenoverse 2, Darkness Twin Star is one of Lord Slug's Super Skills which the Future Warrior (Xenoverse 2) can learn by completing School Quest: "Lesson 2" of Slug's Training. Interestingly, it appears under the name Dark Twin Star in its Tutorial description despite the Skill itself being named Darkness Twin Star in Xenoverse 2.
In Xenoverse 2, this technique can be used by offensively and defensively. After creating the energy spheres they will orbit around the user, damaging enemies if they get close and blocking standard ki blasts. Pressing the button again will allow the user to fire them a the opponent. When the blasts explode the explosion with knock nearby opponents upwards (this occurs whether it is fired or the opponent is hit while they are orbiting around the user).