The neon glow of Nova City pulsed rhythmically, casting an otherworldly sheen on the towering chrome skyscrapers. Astra Blaze, Prism Prime, stood at the panoramic window of Corps HQ, her fiery red hair catching the vibrant light. Unease gnawed at her. Xanathar Prime's recent aggression had been unsettling, and whispers of a growing darkness beyond the Xandrosian borders were rife."Astra," Cygnus Vortex materialized beside her, his dark form shimmering slightly as he manipulated gravity. "Lost in thought again?"Astra sighed. "Just...worried. The intel from the Vorlaxians is concerning. These energy fluctuations near the Necro Nebula...""Nebula Vortex," Cygnus finished grimly. "She's always been unpredictable, but meddling with forces in the Null Dimension is a recipe for disaster."A klaxon blared, shattering the tense silence. A holographic projection flickered to life, revealing a frantic Vorlaxian scientist."Prism Corps! Urgent distress call from the Vorlaxian outpost near the Necro Nebula! Unidentified energy signatures detected. Readings suggest...Nebula Vortex and..." The scientist's voice trembled. "Void Reaver!"Astra's blood ran cold. The combined threat of Nebula's quantum manipulation and the Reaver's hunger for oblivion was a nightmare scenario. "Centurions, report to the hangar bay! Denarians and Millennians, prepare for city defense. This is a Code Red!"Moments later, Astra soared into the neon-streaked sky, her Solar Prism blazing. Cygnus, a blur of swirling gravity, and Vega, a flicker of electromagnetic energy, flanked her. Ahead, a swirling vortex of darkness pulsed ominously, tendrils of energy lashing out towards the crippled Vorlaxian research vessel.A figure materialized within the vortex, her form cloaked in shimmering purple energy. Nebula Vortex cackled, her voice echoing with manic glee. Beside her, a shadowy entity pulsed with an unnatural hunger - the Void Reaver."Foolish Prism Corps," Nebula taunted. "You cannot hope to contain the infinite darkness!"Astra gritted her teeth. "We won't let you unleash chaos upon the galaxy, Nebula!" She unleashed a torrent of solar energy, momentarily pushing back the encroaching darkness.Cygnus manipulated gravity, flinging chunks of asteroids at the vortex, momentarily disrupting its hold on the research vessel. Vega, invisible but potent, unleashed a powerful EMP, temporarily disabling the Reaver's energy-draining abilities.The ensuing battle was a maelstrom of light, gravity, and raw energy. Astra dueled with Nebula, their powers clashing in a dazzling display. Cygnus fought a desperate struggle against the Reaver's tendrils of darkness, while Vega weaved through the chaos, disrupting both villains with bursts of electromagnetic energy.Just as the tide seemed to be turning, a booming voice echoed across the battlefield. "Enough!"A hulking figure materialized beside Astra. Orion Shield, his Celestial Prism glowing with power, slammed into the vortex, momentarily stabilizing it."Nebula," he boomed. "You will answer for your crimes!"A new wave of hope surged through Astra. With Orion by their side, they might just have a chance. But as she glanced at the battlefield, a cold dread gripped her. Dozens of Xandrosian warships materialized from the shadows, their cannons aimed at Nova City. Xanathar Prime had arrived.The battle for the universe had begun.