Author's Note: This is my first time writing a proper fic. Would appreciate the criticism so I can improve. Wrote this for Halloween although I am quite late at posting it. Thanks for reading this

Disclaimer: I don't own PJO or related fandoms.

The Enchanted Forest

It was a gloomy Halloween night at Camp Half-Blood, and the demigods were celebrating their annual Halloween party. Decorations adorned the cabins, and laughter and excitement filled the air. Percy Jackson, the son of Poseidon, had been looking forward to the festivities, but a strange feeling gnawed at the back of his mind.

As the night wore on, Percy decided to take a stroll through the forest with Annabeth. Unbeknownst to them, the spirit of Halloween had awakened an ancient power that lay dormant in the heart of the forest. The trees, fueled by dark energy, began to stir and come to life.

As Percy and Annabeth ventured deeper into the woods, the once-silent trees started whispering, their branches rustling ominously. The duo exchanged glances, their unease growing with each step. Suddenly, a violent gust of wind rustled the leaves, and the trees surrounding them loomed over, blocking their path forward.

Percy drew Riptide, his celestial bronze sword, while Annabeth readied her dagger. They prepared for battle, ready to face whatever mysterious force lurked within the enchanted forest. But to their surprise, the trees did not attack. Instead, they began to speak, their voices filled with ancient knowledge and eerie musicality.

"All demigods, turn back now," the trees warned in unison. "This path leads to an ancient and powerful entity known as the Forest Lord. He seeks to claim the souls of those who dare to enter."

Percy, never the one to back down from a challenge, stood tall and defiant. "We cannot let fear rule us," he declared. "If there's a threat to Camp Half-Blood or the mortal world, we have to face it."

The trees trembled with a mixture of admiration and concern. "Very well, brave hero," they whispered. "But know that once you cross this threshold, there will be no turning back."

With determination in their eyes, Percy and Annabeth pressed on, carefully navigating the twisted paths, their senses heightened for any signs of danger. The forest grew eerier, its dark energy suffocating them. Strange shadows danced between the trees, and whispers reverberated through the air.

As they reached a small clearing, the ground trembled beneath their feet, and a majestic figure emerged from the depths of the forest. Towering above them was the Forest Lord, a being made entirely of tree branches, his eyes glowing with an otherworldly light.

"You dare defy me, mortal?" The Forest Lord's voice boomed through the clearing. "I am the guardian of this forest, and your presence threatens its balance."

Percy stepped forward, Riptide gleaming in his hand. "We mean you no harm," he asserted. "But if you're a threat to Camp Half-Blood or the mortal realm, we won't hesitate to fight."

The Forest Lord chuckled, the sound reverberating throughout the forest. "You misunderstand, hero. I am not here to harm you or your world. This forest is my home, and I am its protector. But the spirit of Halloween has tainted its essence, granting the trees a malevolent sentience."

Realization dawned on Percy. "Then let us help you restore the balance," he offered. "Together, we can cleanse this dark energy and bring peace to the forest once more."

Moved by Percy's compassion and bravery, the Forest Lord agreed. Roots emerged from the ground, intertwining with Percy and Annabeth's feet, connecting them to the heart of the forest. In a surge of power, they channeled their divine energy, purging the malevolent energy that had corrupted the trees.

As the last traces of darkness dissipated, the forest regained its vibrant spirit. The trees swayed gently in gratitude, their newfound sentience restored to its natural state. The Forest Lord bestowed his blessing upon Percy and Annabeth, vowing to protect them whenever they needed.

As the demigods returned to Camp Half-Blood, they were met with cheers and applause. The Halloween party resumed, this time infused with a deeper sense of awe and appreciation for the balance between the mortal and supernatural worlds. Percy and Annabeth shared a knowing smile, their hearts filled with the enduring connection they had forged with the enchanted forest.

As the years passed, Percy and Annabeth continued their adventures as heroes, battling monsters and protecting the world from threats that emerged from the deepest depths of Tartarus. But deep within their souls, the encounter with the Forest Lord and the enchanted forest they had saved harbored a dark secret.

For within the depths of their memories, Percy and Annabeth had unknowingly absorbed fragments of the forest's dark energy. The malevolent force lingered within them, hidden and dormant, waiting for the moment to unleash its power.

One fateful Halloween night, when the veil between worlds was at its thinnest, the dark energy within Percy and Annabeth awakened. As they slept, their dreams twisted into nightmares, and their bodies thrashed uncontrollably. The demigods woke, consumed by an insatiable hunger for destruction.

Their once unbreakable bond was now corrupted, and Percy and Annabeth became vessels of chaos. Their powers intensified, their every action causing mayhem and despair. The heroes they once were twisted into monstrous figures, driven solely by the malevolent energy that had taken hold of their souls.

Camp Half-Blood, their home away from the mortal realm, fell into chaos as the demigods, who once saw Percy and Annabeth as beacons of hope, now cowered in fear of their terrifying wrath. The enchanted forest, now tainted once more, thrived on the anguish that seeped from the corrupted heroes.

In a final act of desperation, the remaining demigods united, led by a resolute Clarisse La Rue. They confronted Percy and Annabeth, hoping to break through the darkness and bring them back to the light.

A vicious battle ensued, the ground trembling beneath their feet as powers clashed and devastation unfolded. But the dark energy within Percy and Annabeth had grown too powerful, fueled by the despair-filled cries of their fallen comrades.

In a heart-wrenching climax, Clarisse - the last hope of Camp Half-Blood - sacrificed herself, unwilling to let her beloved camp fall into eternal darkness. Her sacrifice momentarily weakened Percy and Annabeth, allowing the other demigods to force the corrupted heroes toward the edge of a cliff, poised to end their reign of destruction.

The starless night sky bore witness as Percy and Annabeth, their eyes vacant and hollow, plunged into the abyss below. Their lifeless bodies were consumed by the darkness, a tragic end to heroes who had once saved the world with unwavering bravery and unwavering love.

Camp Half-Blood was left in ruins, tainted by the sorrow and loss that had befallen it. The enchanted forest, free once more, regained a sliver of its former glory, the echoes of its dark secrets forever haunting its depths.

And so, the tale of Percy Jackson and Annabeth Chase became a chilling legend, retold as a cautionary tale to young demigods. Their fall into darkness served as a stark reminder that even the mightiest heroes could be consumed by the very light they once fought to protect, forever etching a haunting legacy in the annals of Camp Half-Blood.