The Battle of Hidden Realms

Once upon a time, in a cosmos that existed parallel to ours, there lay three mystical realms - Aag-land; a scorching hot world filled with flaming inhabitants with fire in their veins, Voda-realm; a tranquil aquatic kingdom where serene blue merfolk resided, and Prithi-realm; a world layered in lush greenery, where the sturdy, earthen people thrived. These might sound wildly fictitious to a mortal's ears, but story holds in its bosom, a thread of reality.
The mythos states that God himself, on his visit to the three realms, left behind a fragment of his mirror, The Divine Fragment, in each one. These fragments held the divine power of creation and destruction. Peace reigned for centuries in these realms. Slowly, an ominous greed for the possession of all three fragments started wrapping its cold tendrils around the hearts of the three ruling monarchs.
The king of the Aag-land, Inferno, was the first to surrender to the darkness. Orchestrating a massive attack, Inferno's army invaded Voda-realm, wreaking havoc in the tranquility of the aquatic world. Queen Oceania stood her ground, defending her realm with all the might she could muster. The demonic blaze of Inferno was met with the soothing but deadly waves of the queen.
News of the on-going war reached Terra, the ruler of Prithi-realm. Shaken, Terra contemplated the cataclysmic consequences of capturing all three fragments. Hoping to make peace, Terra invited both monarchs to a neutral ground for a colloquy. In the council organized, Terra, his voice as stolid as a rock, tried to explain the potential catastrophe of his worst premonitions. The king and queen, blinded by their insatiable thirst for power, dismissed the warnings.
Terra was left with no choice but the preservation of his realm and the universe. As a guardian of the Divine Fragment of his realm, Terra’s inner strength was unmatched. His people, conjuring their innate earth powers, built a labyrinthine castle of unbreakable stone around his palace, guarding the priceless artifact.
As foreseen, the ruthless Inferno and stubborn Oceania turned their forces against the Prithi-realm. An unprepared assault was the best attack, and so under the cover of infinite cosmic darkness, they deployed their troops. The ultimate war for supremacy had begun.
The sky filled with smoke and steam, the unpleasant offspring of fire meeting icy water. Prithi Warriers fought courageously, protecting their kingdom with valiant earth magic. The chaos was deafening, and the hope for peace was diminishing with each passing moment.
But Terra had a secret weapon – a mythical beast named 'Fusion', dwelling deep within the labyrinth. Fusion was an earthly avatar resulting from the union of wind and earth. This creature had unimaginable strength and, more importantly, the ability to blend powers. As Inferno and Oceania fought, their released energies seeped into the labyrinth. Sensing the rushed influx of powers, Fusion awakened.
Unleashed, Fusion rose from the maze, combatting the mighty Inferno and resilient Oceania. The beast, never known to the realms, stood as a symbol of unity, an embodiment of merged elemental powers. It absorbed the vexed energies of the battling monarchs, wielding forces that pushed back their troops and slowly, a silent hush fell over the battlefield.
Before a gobsmacked crowd, Fusion from the forces it absorbed, created a miracle. In mid-air, it combined the Divine Fragments from each realm. The fragments spiraled around each other, drawing energy that caused a blinding explosion. When the light subsided, a colossal mirror floated in the air, reflecting the awestruck faces of everyone present.
Fusion, with its final breath converted itself into a powerful energy beam, hitting the mirror, in a holographic showcase of divine intervention, God appeared. His voice echoed across the mystified audience, reprimanding the monarchs for their greed and ignorance. He then sighed, and in a compassionate voice, explained that the fragments were intended to symbolize unity and peace, never war.
He enforced peace treaties between the realms and announced the return of the separate fragments. The mirror shattered, and the Divine Fragments nestled back in their respective homes, stripped of the power to cause war again.
From then on, the realms coexisted peacefully, a valuable lesson learnt, and thus was the tale of the Battle of Hidden Realms. A legend, a real-time event, a warning for times to arrive, no one knows. But one thing is sure, the universe harbors mysteries, some visible, some hidden deep in the folds of unbelievably powerful tales.