Matt finally located the throne room, and entered with relative ease. The place was pitch black. The only light came from the deck he held, and his suit, as well as his shoes. Matt cautiously walked forwards, and suddenly, a voice made him whirl about, to only be greeted by darkness. "Matt! So good to see you. I was thinking I'd have to cancel my next gig!" Matt gritted his teeth. "All right, that it! Cut the bullsquit, Lux! Show yourself at once!" Matt brought out the gleaming black cube from his pocket. He whispered to it. "Form Synthwave Gun." A monotone female voice was heard. "Forming: Synthwave Gun." The sounds of parts moving and locking into place were heard, and Matt saw that there was a circular slot for the deck he held. Matt slid it on, the gun beginning to glow a bright blue. He readied it, and Lux's voice came again, followed by footsteps in front of him. "Ha! That's more like it. But I think we need a bit more light, don't you?" Lux snapped her fingers, and the darkness was broken by pink-and-purple lights that lined the walls. The floor began to glow blue, and it flashed an array of colors, like a dance floor. Lux was now visible, a little ways from him. She put a hand on her hip. "Let's go, squid boy."

The fight kicked off with Lux firing her beatbox gun, the projectiles being dodged by Matt. The music they produced with their guns could be compared to a music battle, with Lux delivering soft, rhythmic beats, while Matt shot with sharp, electric beats as a counter. Both had the determination to win it, and neither was gonna surrender to the other. While Lux kept her composure, Matt circled her, firing off projectiles and dodging her beats. In the middle of it all, there were supplementary sound effects played seemingly from nowhere. Soon enough, their guns got an upgrade, switching the music a bit and giving their main parts more emphasis each time. They occasionally get into melee attacks, where one of them goes for a punch that the other dodges or blocks, then counters.

Matt kept a steady hand on his gun, as the fight moved into Phase 2. Lux's shots spread out, homing in on him while Matt shot them down. He countered with a few chaser and charge shots, which Lux dodged herself. She taunted Matt occasionally, saying he's too weak to beat her. Matt ignored her taunts, as he was too focused on dodging her shots. He charged up a sniper-style shot, and fired directly at Lux. She blocked it with her gun, which took a bit of damage. Matt noticed this, and kept the pressure on her. She shot him repeatedly, but his reflexes were too fast for her to react. All that osu! must be paying off. Despite the reflexes however, Lux was able to shoot him in the arm, stunning him for a moment. She took it to hit him with a charge shot of her own, which landed in the leg. Matt kneeled for a moment, before doing a shadow dash to the other side of the arena. Before Lux could turn around, Matt kicked her down, before retreating. Their guns upgraded once more, which happens when something occurs to the user. In this case, Matt having the upper hand and Lux, for just a moment, feeling that she could lose this fight.

Lux put up her strongest attacks for Phase 3. She chained shots together, many of them fast enough to graze Matt. In return, he waited for the perfect times to fire, and landed a few crucial shots on her arm, gun, and abdomen. She did a handful of dodging herself. Looking at it, it would look like the Agent 8 vs Agent 3 fight. Her shots didn't do much, and the electric beats from Matt's gun were able to shock her whenever they landed. Her soft beats couldn't counter his sharp ones. Matt noticed she was getting tired and weak, and went all in. He fired multiple fast shots, charge shots, and homing shots. She couldn't dodge them all, as Matt had predicted. She got hit by most of them, but they didn't kill her. She tried to counter, but her arms wouldn't cooperate. She could still stand, but her weapon was unusable. She was on the verge of losing. Matt shot her gun, and she could barely put up a fighting stance.

 Matt kicked her, then grabbed her. He looked her in the eyes, and smiled like a devil. He threw her down on the ground, then turned. It was over. Lux stealthily crawled backwards, going for her gun as Matt began speaking to her. "You were a worthy opponent, Lux. I know you may think you're still gonna be able to win this, but you won't." Matt finished and Lux grabbed the gun and pointed it at him. But before she could fire, Matt turned around quickly. "And your next line is, "I wouldn't be so sure about that, boy!"!" "I wouldn't be so sure about that, boy!" Lux gasped. How did he know what she was gonna say!? Before she could react however, he kicked away the gun, then picked her back up, by the neck. He threw her on the ground, before whispering to his Synthwave Gun. "Form Turntable." He threw it on the other side of the arena, where it became its original form. He leaped behind it, took the deck, and put it on the top. The turntable glowed, signaling it was active. "I'm not done yet, Lux! Your judgment has arrived! HIT IT!" He played the deck, revealing the song inside. Boss Mode.

"I hope you're ready, Lux, because you're in for a bad time."