Chapter Text
The air in the Underworld was heavy.
It clung to Percy like wet wool, thick and suffocating. Every breath she dragged into her lungs felt reluctant, as though the world itself resisted her being here. This air wasn’t meant for the living. It tasted of ash and minerals, of centuries pressed into dust and left to rot. The longer she breathed it, the more her ribs ached, as if her chest wasn’t built to hold it.
Shadows didn’t just fall here — they crawled. They bent in strange directions, slithering across the cavern walls, pooling in corners like predators waiting for their chance.
Sometimes Percy swore she saw one moving just too late, as if it froze the instant she looked at it.
Her hand tightened on her sword. Her knuckles were slick against the hilt, and it took everything she had not to let it tremble.
Lelex walked at her left. His eyes were sharp, restless, cataloguing every possible danger — above, behind, beneath their feet. It was the look of someone trying to memorize a battlefield that could never be memorized. The Underworld shifted too much.
Behind them, Psyche’s lips moved constantly. Words poured out in whispers, part spell, part prayer, even she wasn’t sure which. The sound was fragile in the silence, like glass beads rolling across stone.
They stopped.
Before them loomed a pair of doors carved from obsidian, so tall they seemed to scrape the violet haze above. Silver veins ran through the rock, pulsing faintly like veins beneath skin. Symbols sprawled across the surface — not Greek, not anything Percy recognized. The more she tried to read them, the more they writhed, sliding away like eels.
The air crackled. Old magic, alive and listening.
Then, with a groan that rattled bone, the doors began to open.
A gust swept out. Not wind. Not breath. Memory.
It carried the weight of centuries: the sighs of the dead, the laughter of the lost, the cries of souls who had gone too soon. Percy’s throat clenched. For one, impossible heartbeat,
she swore she heard her mother’s voice in the current, calling her name.
No. Just the Underworld, digging in.
Inside stretched the throne room. Vast. Endless. A black ocean of stone.
The ceiling vanished into swirls of smoke and dim violet light, too far away to measure. The walls were not stone — not entirely. Faces writhed just beneath the surface, pale and desperate. They pressed forward as if clawing to break free. Some mouths gaped in silent screams. Others whispered words too faint to catch, though Percy swore the sounds curled directly into her ears.
And at the far end, sitting upon a throne of bone and fire-blackened rock, was Hades.
His cloak billowed though there was no wind, darker than midnight, stitched with sparks of light like dying stars. His skin wasn’t sickly pale, but ancient pale — marble long left in shadow. His face looked carved from stone, yet alive with power. His eyes burned. Not fire, not heat — but the memory of it. A cold flame. A judgment that never dimmed.
When he spoke, the sound echoed through the throne itself.
“Well,” Hades said, voice a whisper and a boom all at once, “the children arrive. All three of you. My, my… how fate has overreached itself.”
Psyche raised one eyebrow. “Great. Another ominous uncle.”
Lelex’s elbow caught her ribs. “Shut up. He can literally smear you across the floor.”
“Yeah,” Percy muttered, forcing her voice steady, “and you’d still make a snarky comment.”
But humor didn’t last long here. Not under his gaze.
Hades’ eyes locked on them like iron. Percy couldn’t breathe. She’d seen gods before — Poseidon in storm-wrath, Athena’s wisdom honed sharp as a blade. But Hades was different. He wasn’t rage. He wasn’t cunning. He was inevitability.
The god who watched the end of all things.
“You know why you’re here,” he said. “The Master Bolt. The world above accuses me of theft. I, in turn, accuse your father—” his voice sliced sharp, “Poseidon.”
The name stung like a slap. Percy flinched. Every time she heard someone spit it like poison, something twisted in her gut. Still, she forced her voice out.
“We didn’t come to accuse anyone,” she said. Her tone was taut as wire. “We came to return what was stolen.”
Hades narrowed his eyes. “Ah. So you admit… you have it.”
“What?!” Percy staggered. Her sea-green eyes snapped to her siblings. “We don’t—”
And then Lelex shifted his backpack.
The sound came first. Low. Distant. Like a storm’s first rumble.
He frowned and unzipped the bag.
The moment the zipper parted, blinding light tore free.
Not light. Power.
It arced upward in a crackle of white fire, sparks crawling across the obsidian walls. Thunder shook the chamber. The Master Bolt rose, humming with a rhythm older than language, older than gods.
Time stopped.
Psyche stumbled back, shielding her eyes. “That— that wasn’t there before.”
“It was planted,” Percy whispered. Horror hollowed her voice. “Someone set us up.”
Lelex’s face drained of color. His throat closed. He hadn’t felt it in his bag. Hadn’t sensed it coiled there like a serpent. How could he have missed it? The guilt burned raw in his chest.
He dropped the bag. The bolt didn’t fall. It hovered, alive, pulsing with restrained fury.
Hades rose.
The air crushed down on them. Percy’s knees buckled.
“You dare,” Hades growled, voice swelling into a storm, “smuggle Zeus’s weapon into my realm? You dare insult me—”
“We didn’t know!” Lelex cried. His voice cracked. “This wasn’t us! Someone’s framing us!”
But it was already too late.
The floor split. Fault lines spread like veins of fire, belching heat and sulfur. Skeletal hands clawed free, bones grinding against stone.
And then—
Laughter.
Not Hades’.
Deeper. Older.
The shadows writhed. Twisted.
“Ahhh…” A voice crooned. Low. Drawn-out. Like a clock ticking its last second. “How deliciously predictable. Right on time.”
The throne room dimmed. Shadows stretched long and black, swallowing light. They gathered at the foot of the throne, pooling thick as tar. And rose.
Hades froze.
Percy’s stomach dropped. She knew that voice.
The figure emerged. Towering. Half-formed from shadow and rusted gold. Eyes like cracked sundials, leaking golden sand. Armor fractured like glass. Each step echoed with a sound Percy hated instantly:
Tick.
Tick.
Tick.
Kronos.
“The children step onto the board,” the Titan mused. “Bearing the bolt. Blaming the brother. Provoking the war. How classic. How… easy.”
Hades lunged forward, shadows boiling at his heels. “You have no claim here, Titan.”
Kronos didn’t even look at him. “Ah, my dear son,” he said, voice like molten lead. “Still playing the warden of the dead. How noble. How boring.”
His gaze cut to Percy. The weight of it nearly drove her to her knees.
“And you. Daughter of the sea. You dream of storms and think yourself a force of nature. But I—” he stretched out his hand, skeletal fingers dripping sand— “I am time. Storms pass. Kingdoms fall. I endure.”
“You’re a ghost,” Psyche spat, trembling but defiant. “And you’re stuck in the basement.”
Kronos’ eyes flared. “Not for long.” His voice boomed, echoing backward through the stones. “Every second brings my return. Every moment, the gods delay. But time devours all. And you—”
He pointed at them. His hand shook, terrible. “You are out of it.”
The floor ripped wider. Heat and despair blasted upward. The wails of Tartarus bled through, hungry, endless.
The Master Bolt pulsed like it wanted to escape.
“Go!” Percy shouted. She grabbed her siblings’ arms.
But Hades was faster. His cloak snapped wide, wings of shadow. “Enough!” His voice cracked with fury and fear alike. “You will not take them, Kronos. Not while I rule.”
He slammed his scepter down. Chains of silver fire exploded from the ground, binding the rift, forcing Tartarus shut. The earth screamed.
“GET OUT,” Hades roared. His eyes burned — not hate. Fear. “You don’t understand. You’re part of something far bigger than this. Kronos wants you for a reason. And that reason terrifies even me.”
Lelex froze. “But—”
“GO!” Hades bellowed. His voice shook the chamber. “Or I will chain you in my deepest pit to keep you safe!”
For a heartbeat, Percy saw it. A flicker in his eyes. Concern.
She yanked her siblings. “Now!”
They bolted. Kronos’s laughter followed — cracked, jagged, endless.
“Run while you can, little pieces! Run forward, the only direction left. But know this…”
The air itself shuddered.
“Every step brings you closer to your end — and my beginning.”
The doors slammed shut behind them.
Silence fell.
Hades stood alone in the dark. The crack beneath his feet still glowed faintly, refusing to close.
He whispered, too soft for any soul to hear:
“You’re not taking them. Not while I still remember what love cost me.”