The tension within Nova City's colossal command center crackled like ionized air. Astra Blaze, Prism Prime, stood before a holographic map of the Andromeda Galaxy, its shimmering tendrils laced with ominous crimson tendrils."Nebula Vortex," Astra's voice boomed, her crimson hair crackling with solar energy, "reports indicate a tear in the fabric of space near the Xylos Cluster. Readings suggest... a Null Breach."A collective gasp resonated from the assembled heroes. Orion Shield, his metallic battle suit gleaming, clenched his fists. "The Null Dimension. That's Void Reaver's playground."Vega Specter, cloaked in electromagnetic distortion, materialized beside Orion. "We need to act fast. Null energy could spread like a wildfire, consuming entire star systems."A figure materialized from a burst of swirling energy – Jace Swift, still adjusting to his role as a Prism Corps Millennial. Anxious energy thrummed beneath his skin. "What about Xanathar Prime? What if this is a distraction?"Astra nodded, her eyes blazing. "Cygnus, Denarian squad – prepare for Xandros incursion. Orion, Vega, join me. We're heading to Xylos."The whir of teleportation filled the air as heroes vanished in bursts of light. Jace, overwhelmed, found himself staring at Commander Lyra Nova, her silver hair pulled back in a tight bun. Her piercing blue eyes locked onto his."Jace," she said, her voice firm, "you're needed here. We need to secure Nova City. Until the others return, you'll be piloting a Prism Battleship."Jace's heart pounded. A battleship? He'd barely mastered the Glider. But there was no room for protest. He saluted, a determined glint in his eyes.Meanwhile, in the Xylos ClusterThe heroes found the once-vibrant Xylos Prime engulfed in swirling shadows. A gaping tear in space, pulsating with an unnatural violet light, hung ominously in the sky."That's the breach," Astra growled, drawing her solar energy into a fiery blade. "Vega, disrupt the Null energy with an EMP blast. Orion, hold the front. I'll try to seal the tear with the Solar Prism."The battle unfolded in a chaotic ballet of light and shadow. Vega unleashed a wave of electromagnetic energy, momentarily disrupting the breach's chaotic flow. Orion Shield, a mountain of metal and muscle, waded into tendrils of Null energy, his Celestial Prism absorbing its dark tendrils.Astra soared towards the breach, a blazing phoenix. But as she neared, a cloaked figure emerged from the swirling darkness. Phantom Mirage, master of illusions, materialized into an ethereal double of Astra."Seems you've brought some friends, Blaze," Phantom taunted, his voice echoing with a chilling distortion.Suddenly, the Illusory Astra lunged, unleashing a torrent of shadowy energy. Astra, caught off guard, was thrown backwards. Orion roared, charging forward, but Phantom shimmered, vanishing into the Null energy.Confusion reigned. Was Astra down? Or was it the illusion? Panic threatened to engulf Jace, piloting the Battleship from Nova City. Commander Nova's voice, however, cut through the chaos."Jace," she barked, "scan for thermal signatures. The real Astra will be hotter."With a surge of determination, Jace focused the ship's scanners. He spotted a faint flicker of heat within the chaotic energy, a point distinct from the illusory duplicate."There!" he yelled, targeting the location with a burst of concentrated plasma fire. The Illusory Astra dissipated in a puff of dark smoke.Astra, wounded but furious, charged towards the breach, unleashing the full might of the Solar Prism. A wave of intense solar energy collided with the violet tear, momentarily pushing it back. But the Null energy pulsed with renewed vigor.Just then, a new voice filled the comms. Cygnus Vortex, his voice strained, crackled through. "Astra! We're under attack! Xandros warships are pouring through a dimensional rift!"Astra gritted her teeth. "Hold on, Cygnus. We're on our way back." But as she turned, another figure emerged from the breach – Rift Walker, his skeletal frame cloaked in temporal distortion. A chilling smile played on his lips."Looks like the party's just getting started," he rasped.The End