The knuckles crackled faintly under heavy strain, and Callum's palm was reddened by the grid texture of this training dagger🩸. In 2419, on the "Anvil" space station at the edge of the Orion Arm, he was a private first class in the 7th Recruit Battalion of the Federal Star Marine Corps, trapped in a completely out-of-control training pod🚀. The AI system originally used for simulated close combat was invaded by an unknown virus, switching all training targets to live-fire mode🤖; recruits around him either fell under stray bullets or were dragged into ventilation ducts by robotic arms. Callum stared at the cobalt-blue dagger in his hand: it was 3D printed from high-temperature resistant biopolymer, the grid pattern designed to enhance grip friction, and the through-hole at the end, originally for mounting training weights, could now fit perfectly into the emergency pipeline interface at his waist🔌. He remembered the instructor mentioning that the emergency pipeline could release high-voltage electric pulses—he abruptly plugged the dagger's end into the interface, and the cobalt-blue blade instantly glowed with pale purple arcs⚡. In the distance, a smoking combat robot was turning its turret toward him. Callum gripped this temporarily converted electric blade and charged forward, while behind him, the station's alarm had turned into intermittent static, and no one knew if this training blade could help him hold out until rescue arrived...