The silence was heavier than the explosion.
The ringing in the infantry's ears slowly bled away, replaced by the hiss and pop of localized fires. Ash drifted like dirty snow, settling over the charred, smoking husks of twenty thousand Elven warriors.
Ulric Stone sat like a statue on his warhorse, cold eyes scanning the devastation. He raised a gauntleted hand.
"Hold formation! Shields up!"
The order rippled down the line. The soldiers obeyed, but their shields rattled. These were hardened veterans who had waded through blood for years, but this wasn't war. It was an extermination. They stared at the massive, smoking crater, then cast terrified glances back at the supply wagons, suddenly acutely aware of the hollow clay spheres stacked inside.
Across the chasm of scorched earth, Lord Commander Carric blinked. Gray ash settled on his pristine white uniform. The furious pride that had radiated from him moments ago was gone, vaporized with his vanguard.
"My Lord..." his second-in-command whispered, voice cracking. "The vanguard... they're..."
Carric gripped his reins until his knuckles turned white. His mind raced, struggling against the sheer impossibility of it. Dust? How does dust shatter an army? He stared through the settling smoke at the human lines. They were holding their shield wall. They weren't pressing the advantage. They were just... waiting.
They want me to charge, Carric realized, the thought turning his blood to ice. They are baiting me again.
Sixty feet below the killing fields, the air tasted like copper and old dirt.
Captain Fenn hacked a glob of grit from his throat, spitting it into the dark. He raised a flickering light crystal, casting long, jagged shadows down the narrow tunnel. Around him, fifty sappers worked in desperate, synchronized silence. The rhythmic thud of shovels chewing through bedrock was the only sound.
Then, the ceiling heaved.
A muffled, deafening THUMP shuddered through the soil. Dirt rained down in blinding sheets. The heavy timber supports groaned, bowing inward under a massive, sudden shift in the earth above. Sappers dropped to their knees in the dark, clutching their ears as the concussive force of the surface explosion battered them.
"Brace the beams!" Fenn roared. He dropped the crystal and threw his massive shoulders against a buckling wooden pillar. "Brace them!"
Three sappers threw their weight beside him. The wood screamed against their backs, splintering under the pressure. For a terrifying handful of seconds, the earth threatened to swallow them. Slowly, the tremors faded. The tunnel settled back into a suffocating stillness.
Fenn exhaled, his lungs burning. "The commander just blew the powder trap," he rasped, wiping a smear of wet mud from his eyes. "Carric is going to be out for blood now. He'll throw everything he has left at our lines to break them."
He turned to his lead combat engineer. The wiry, scarred veteran was kneeling in the dirt, carefully unwrapping a bundle of glowing red parchment. The explosive magic scrolls pulsed with a volatile, rhythmic heartbeat, casting a bloody light against the tunnel walls.
"Distance to the center?" Fenn asked.
The engineer checked a tarnished brass compass, wiping dust from the glass. "Twenty yards. But... the shockwave compacted the bedrock ahead of us. Soil's too dense for shovels." The engineer hesitated, looking down at the pulsing red scrolls. "We have to switch to heavy picks. If we strike a flint pocket while carrying these..."
The threat hung in the stale air. If a single spark from an iron pickaxe caught the ambient mana leaking from those scrolls, it wouldn't just collapse the tunnel. It would trigger a blast big enough to turn the entire valley into a canyon.
Fenn swallowed hard. He looked at the exhausted, dirt-streaked faces of his crew.
"Picks out," Fenn ordered, his voice a gravelly whisper. "And pray to whatever gods you keep that you swing straight."