The tunnel vibrates with the thunderous stammering of weapons. The orks stagger around and collapse. Streaks of dazzling white like headless comets blast outward in every direction. A greenish haze, sparking and glinting like some arcane energy shield, swells out of nothing to fill the tunnel ahead. Then, from the fallen orks rise a half dozen semitransparent orbs, orangey, like bubbles, but about the size of melons. The orbs float up like they’re bobbing on currents of air and start drifting all around. A dozen more follow, then more and more. They float into the tunnel walls and ceiling and vanish.