The name "Lucent Harmony" didn't quite capture the essence of what Luna's beast will bestowed upon me.

'It's like stepping into a hidden realm I couldn't see before,' I mused, observing the swirling mana particles around me. The Qilin insignia now adorned my arms, face, and neck, pulsating with raw energy.

The distortion of space around me signaled my return to the real world, a landscape marred by destruction. Trees burned and froze in equal measure, a testament to the ferocity of the battle raging around me. Lucifer clashed relentlessly with the Elder Dark Treant, his formidable magic carving through the chaos with unwavering precision.

With Lucent Harmony at my command, I gained a newfound appreciation for the strength displayed by both combatants. 'Lucifer is truly strong,' I reflected, acknowledging his prowess in the face of such a formidable opponent.

Even if I were to reach -rank, I doubted I could match his skill in combat. The Elder Dark Treant, a 6-star beast, posed a big challenge, yet Lucifer held his ground with remarkable skill. Rachel's support with 4-circle magic undoubtedly aided him, but it was Lucifer's sheer prowess that drove the battle forward.

It was a display of power and resilience that surpassed all expectations, especially considering Lucifer had yet to attain -rank status.

'Can I do it now?' I pondered silently.

Empowered by Lucent Harmony, my grasp of 5-circle magic, and my mana rank at , I entertained the possibility of casting spells at the 5-circle level despite not reaching the -rank due to my ability to harness ambient mana. Furthermore, I considered employing the Laplace method to streamline the intricate mathematical calculations involved in such advanced magic to speed up the casting.

I began by casting the familiar 4-circle spell, Flame Lance, but this time, I infused it with lightning mana, adding a layer of complexity to the incantation. Despite the added challenge, I applied the Laplace method to streamline the calculations, relying on the flow of ambient mana to guide me.

I forged ahead, casting the 5-circle spell: Fiery Thunder Spear. The name felt uninspired, but it was a minor concern amidst the intensity of the moment. Gripping the spear in my left hand and wielding my sword crackling with lightning aura in the other, I aimed my attack at the beast.

As I launched the spell, I felt the strain of wielding such advanced magic for the first time. The intricacies of casting a 5-circle spell were daunting, requiring precise control and focus. And to add to the challenge, I also grappled with the unfamiliarity of using space magic to evade the Treant's roots.

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Yet, despite the difficulty, I pressed on, channeling every ounce of my newfound power into the spell. With a surge of energy, the Fiery Thunder Spear hurtled towards its target, its formidable might amplified by the fusion of fire and lightning.

Even as I dodged the onslaught of roots with swift manoeuvres aided by space magic, I couldn't shake the exhilaration of casting 5-circle magic for the first time. It was a momentous achievement, marking a significant milestone in my journey as a mage.

While I knew that a mere 5-circle spell wouldn't inflict significant damage on a formidable 6-star creature like the Elder Dark Treant, I didn't dwell on that fact. Instead, I focused on closing the distance between us, my sights set on aiding Lucifer in delivering the decisive blow.

Repeatedly, I lunged forward, anticipation coursing through my veins as I awaited the perfect moment to unleash my 5-circle God Flash. The Elder Dark Treant remained our primary target, its towering form a daunting adversary that tested our every move.

Yet, as the battle raged on, I couldn't ignore the strain on my -rank mana core. With each spell cast, I felt the energy within me dwindling, threatening to deplete entirely if I didn't act swiftly.

Finally, my patience was rewarded when Lucifer unleashed a devastating attack that inflicted significant damage on the Treant. Seizing the opportunity, I sprung into action, channeling the last remnants of my mana into the spell.

The 5-circle spell: God Flash.

Its inferior 4-circle variant was my go-to, the spell that had never let me down, even in the face of the most formidable foes.

With a blur of motion, I closed the distance between myself and the Elder Dark Treant, moving with a speed that left its tendrils and roots trailing in my wake.

As I reached the beast, I swung my sword, crackling with lightning, down with all my might. It was a move born of instinct and determination, fueled by the unwavering trust I had in the power of God Flash to see me through even the direst of situations.

My attack struck the beast with full force, the crackling energy of God Flash engulfing the Elder Dark Treant in a torrent of searing heat. Wood charred and turned to ash in its wake, leaving the behemoth slightly weakened as it crumbled under the onslaught.

Yet, I knew that my blow alone wouldn't be enough to fell a creature of this magnitude. As the Treant staggered from the impact, Lucifer seized the opportunity to unleash the devastating power of his Grade 6 art, [Cocytus's Descent].

With a flourish of his hand, the air around us turned icy cold, frost spreading like tendrils of death to freeze everything in its path. The Elder Dark Treant, already weakened by my assault, succumbed to the freezing chill, its movements slowed to a crawl as its monstrous form was encased in a prison of ice.

As the icy grip of Cocytus's Descent held the Elder Dark Treant in its grasp, we watched with bated breath as the once formidable creature succumbed to its fate. Cracks spread like veins across its frozen form, and with a final, resounding shatter, the Treant collapsed into a heap of shattered ice and splintered wood.