The castle slept.

  Not the restless sleep of soldiers or servants—

  But the deep, ancient stillness of stone that had outlived kings and betrayals alike.

  Torches burned low along the spiral stair. Their flames bent inward as Serena descended, her hand pressed lightly to the wall as if the castle itself might steady her.

  Mercer followed two steps behind.

  Always two steps behind.

  “Rena,” he said quietly.

  She did not stop.

  The corridor narrowed the deeper they went. The air grew colder. Heavier. Shadows thickened where no light should linger.

  The sigils carved into the walls were old.

  Older than the Fallen.

  Older than the Trials.

  Older than the Seven.

  Mercer’s boots halted.

  “You still haven’t taken the potion,” he said.

  Serena paused.

  Slowly, she turned.

  In his hands were two small glass vials, stoppered and faintly glowing with stabilizing runes—medicine bought with blood and favors from a world that despised them.

  “I’m saving it,” Mercer continued, voice rough, “for you.”

  Serena lifted a trembling hand to her neck. Fingers brushed the shadow-veins hidden beneath cloth and skin. They pulsed faintly now.

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  Angrier than before.

  “I will be fine,” she said.

  The words felt thin.

  “What I saw in the coliseum… that was not normal. That wasn’t training. That wasn’t destiny.”

  She faced the sealed doors at the end of the hall.

  “That power almost consumed the city.”

  Mercer stepped forward.

  “And if you open that vault, you may damn him instead.”

  The doors loomed.

  Black stone veined with living shadow. Chains etched into their surface like scars that never healed.

  “There is no certainty he can wield it,” Mercer said. “No proof he is ready.”

  Serena’s shoulders stiffened.

  “And if I do nothing,” she replied, voice cracking, “those same shadows will consume him anyway. You saw what nearly happened. You felt it.”

  Mercer moved.

  He dropped to one knee before her. Shadows pooled instinctively around him—loyal even when hope was not.

  “You are my queen,” he said.

  “But you have always been my sister.”

  Serena froze.

  “I beg you,” Mercer whispered. “Wait. Let the boy become a man. That weapon demands a king.”

  At last—

  She broke.

  Serena sank to her knees before the sealed vault, a sob tearing free as years of restraint collapsed all at once. Mercer caught her as she folded, her forehead pressed to his shoulder as she shook.

  “When my brother wielded that sword,” she cried, “nothing stood in his way.”

  Her voice rose—raw, uncontained.

  “It took all of them to bring him down.”

  Her fists knotted in Mercer’s cloak.

  “They lied,” she whispered.

  “Every last one of them.”

  “About him. About us. About why he fell.”

  Her breath hitched.

  “They were afraid.”

  The shadows along the walls writhed.

  Listening.

  Behind the sealed doors—

  Something answered.

  Deep beneath the castle, far below crown and court, the vault stirred.

  Chains groaned.

  A massive shadow dragon lifted its head, eyes opening like twin voids in the dark. Its wings unfurled slowly, stirring ancient dust that had not moved in decades.

  And at the center—

  A sword.

  Pure black.

  Not forged.

  Condensed.

  Shadow given shape.

  God-blood cooled into steel.

  Chains of living darkness bound it to the stone, yet even restrained it pulsed—

  Hungry.

  Yearning.

  Waiting.

  The blade shivered.

  Not at Serena.

  But at a name it could almost remember.

  Somewhere above—

  A new king stirred.

  And the sword knew.