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Mistborn: A Morgan le Fay Story

Summary:

Summoned from the mists of Avalon to the court of Camelot, Morgan finds herself at the center of a kingdom’s hopes—and its most dangerous desires.
A character-driven AU steeped in magic, prophecy, forbidden love, and the hunger for self-determination.

Notes:

This story draws deeply from The Mists of Avalon: its myth, its mood, its reverence for feminine power.
It takes place in that universe, but follows an alternate backstory and path.
As in the book, Morgan is conflicted, painfully human, powerful, flawed, luminous, passionate — and never a villain.
Step into the mists knowing this tale belongs to her, and to the choices she claims for herself.
Thank you for reading.

 

 


Chapter 1: The Unquiet Hall

Chapter Text

The great hall of Camelot reeked of tallow smoke and roasted boar, its stone walls blackened by years of feasts. Torchlight flickered, casting shadows that danced like spirits, while a bishop muttered prayers as he scanned the crowd for pagan whispers.

Tonight’s feast celebrated the harvest, a rare moment of peace in Arthur’s fledgling reign. Lords and ladies swirled in a kaleidoscope of silks and furs, their laughter mingling with lute and harp echoing off the walls.

Arthur, seated at the high table, felt no ease. His eyes, blue as the summer sea, remained fixed on a single point in the room: Morgan.

No mere lady of the court, she was storm, riddle and flame—too bright to contain, her raw power both gift and threat.

She stood at the far end of the hall, a vision in purple and gold, her gown clinging to her like a lover’s whisper, strands of dark hair catching the light like polished obsidian.

Her skin, golden olive, spoke of sun-kissed mysteries and pagan rites, setting her apart from the pale nobility around her. And her eyes—sharp, green, wild—held a spark of something untamed, something that called to Arthur in a way he could neither name nor resist.

Morgan, his half-sister, born of their mother Igraine’s fleeting indiscretion during a Beltane rite, a night of bonfires and abandon while Uther was in battle far away. A warrior with woad tattoos, spirals of blue on his skin, had claimed Igraine under starlit flames, vanishing at dawn—eliciting whispers that he was a spirit of the Old Gods.

Arthur was ten when Morgan was born. Igraine, heavy with shame, had sent her to be raised by Viviane in Avalon, where mists guarded secrets and the old magic thrived. Morgan was whisked away under the cover of darkness, never to return until now.

She had come to Camelot only a year ago, at eighteen, forged in the crucible of mists and magic.

For eighteen years, Morgan honed her skills in Avalon, studying herb-lore, rituals, and spellwork, her raw magic—perhaps tied to her father’s wild blood—setting her apart. Under Viviane, High Priestess and keeper of enchantments older than kings, she was shaped into something not quite mortal.

 Arthur had requested his half-sister's presence at court, yearning for her company, unaware that this fulfilled Viviane's designs to place Morgan's power at the heart of the kingdom.

Whispers of Morgan’s lineage trailed her like shadows, but Arthur had spun a tale to silence the court: Morgan, born a sickly child, had been sent to Avalon for its healing waters and fresh air. That was his final word, and none dared to challenge the king.

What he didn’t expect though, having not seen her since she was spirited to Avalon, was that he would feel for her in ways no brother should.

Now, watching Morgan weave through Camelot’s hall, those memories fueled a fire Arthur could not quench.  His fingers tightened around his goblet, the wine untouched. Morgan stirred a deep, forbidden longing within him. It was a truth he buried, a sin he dared not confess—not even to Merlin. Or to himself.

Guinevere, his queen, sat beside him, her golden hair catching the light like a halo, her beauty serene and angelic. She was everything a king could want—beautiful, graceful, beloved by all. Yet Arthur’s heart, traitorous and wild, yearned for the one woman he could never have.

“Arthur,” Guinevere’s soft voice broke his reverie, her hand grazing his arm. “You seem distant. Is all well?”

He forced a smile. “All is well, my love. The feast is a triumph.”

She nodded, her blue eyes searching his face, but she said no more. Arthur’s gaze drifted back to Morgan, his heart stuttering.

She was laughing now, her head tilted back, hair swaying as she spoke with Lancelot. The knight, curse him, leaned too close, his dark eyes sparkling with that roguish charm that had already ensnared Guinevere’s heart. Arthur heard whispers about them—his best knight, who was also his best friend—and his queen, though he’d never confronted either.

He could perhaps forgive Guinevere for her weakness. But Morgan? The thought of Lancelot’s hands on her, his lips near hers, sent a white-hot fury coursing through his veins.

Morgan’s laughter rang out again, clear and bright. She was mesmerizing, her every gesture alive with a magic that seemed to hum in the air around her, drawing stares—not just Lancelot’s or Arthur’s, but from knights and lords across the hall, drawn to her like moths to a flame.

Her gown shimmered as she moved, and Arthur could not tear his eyes away. She was no longer the child of whispered tales, the girl raised in Avalon’s shadowed groves. She was a woman, radiant, beautiful, and dangerous.

She was his undoing.

Lancelot murmured something, and Morgan’s lips curved into a sly smile. She touched his arm lightly, a gesture that seemed innocent but drove a spike through Arthur’s chest. He stood abruptly, his chair scraping against the stone floor. Heads turned, but he didn’t care. He descended from the high table, the crimson cloak billowing behind him, his crown glinting like a warning.

“Morgan,” he said, voice calm but carrying the weight of command as he approached.

She turned, her eyes locking onto his, and for a moment, the world fell away. There was no Lancelot, no Guinevere, no Camelot—just the two of them, bound by blood and something far darker.

Her smile softened, but there was a challenge in her gaze, as if she knew the storm raging within him. “Brother,” she said, voice like velvet, laced with a teasing edge. “You’ve left your queen to join us?”

Lancelot bowed, his grin infuriatingly easy. “My lord, I was just telling Lady Morgan of last week's hunt. A fine tale, if I do say so. The Lady seemed especially fond of the part where I nearly lost my horse.”

Arthur’s eyes flicked to Lancelot, cold and sharp. “I’m sure it was riveting,” he said, his tone clipped. “But I’d like to speak with my sister alone.”

Lancelot’s brow arched, but he stepped back with another bow. “Of course, my king.” He melted into the crowd, leaving Arthur and Morgan standing too close, the air crackling between them.

Morgan tilted her head, studying him. “You’re angry,” she said, not a question. Her voice was warmer now, almost intimate. “Why?”

“You know why,” Arthur replied, barely above a growl. He wanted to say more—to shout that Lancelot had no right to look at her, to touch her—but the words choked in his throat.

Instead, he said, “You should be careful with him.”

Her eyes narrowed, a spark of defiance flaring. “Careful? Sir Lancelot is your faithful knight. Your friend.”

She stepped closer, her scent—wild herbs and something faintly sweet—enveloping him. “But you, Arthur… you look like you’d slay him where he stands. Why is that?”

A sharp breath caught in his throat. She was too close, her presence overwhelming. He could feel the heat of her body, the faint shimmer of magic that seemed to cling to her skin. “He’s not worthy of you,” he said, the words slipping out before he could stop them.

Morgan’s lips parted, surprise flickering across her face. Then she smiled, a slow, dangerous smile that made his blood burn. “And who is, dear brother?” she murmured, her voice a spell in itself.

Arthur’s hands clenched at his sides, every fiber of his being screaming to pull her to him, to cross the line he could never uncross. But he was king, and she was his sister, and the weight of duty anchored him in place.

“Stay away from him,” he warned her. “For your own sake.”

She laughed softly, a sound that pierced his heart. “You may command Camelot, Arthur. But not me.”

She turned and glided back into the crowd, leaving him standing alone, chest heaving, his world tilting dangerously.