Black Clover fans witnessed one of the most shocking character developments when the untouchable lioness Mereoleona Vermillion crossed the ultimate threshold between life and death. Her legendary status as an undefeated warrior took a supernatural turn, questioning the very nature of existence in Yuki Tabata's magical universe.
In chapter 371 of Black Clover, Mereoleona Vermillion pulled off the unthinkable: she became the first human to fully control Ultimate Magic and even brought her fallen allies back to life. Her transformation into pure mana during the climactic battle against Morris represents not just a victory but a complete transcendence of human limitations that fundamentally changed her existence forever.
Mereoleona's journey toward ultimate power began with her intensive training in volcanic regions. She trained by immersing herself in lava, sharpening her skills in the brutal conditions of the Grand Magic Zone. This extreme training regimen in Black Clover allowed her to develop exceptional mana control and pushed her magical capabilities.

While battling an ancient demon in the Spade Kingdom, Mereoleona unleashed her newly advanced abilities. Her transformation into Hellfire Incarnate represented a breakthrough in her magical development. The blazing energy covering her body was clear proof of her total control over mana. It allowed her to fly effortlessly and deliver devastating attacks against seemingly insurmountable opponents.
The climactic moment arrived during Mereoleona's battle against Morris, one of the most dangerous adversaries in Black Clover. After losing her arm in combat, she used her Hellfire Incarnate abilities to reconstruct the limb from pure mana. This display of power was merely a precursor to what would become her greatest achievement.
In Chapter 371 of Black Clover, Mereoleona shattered her own limits and released her strongest spell yet—Ultimate Flame Magic: Excelicitus Leonum. This unprecedented transformation marked her as the first human to achieve proper Ultimate Magic, surpassing the limitations that had previously constrained her growth.
Resurrection Powers and Transcendence in Black Clover

The most remarkable aspect of Mereoleona Vermillion's Ultimate Magic involves her ability to resurrect fallen comrades. During her final confrontation with Morris, she manages to bring back the souls of her deceased Crimson Lion Kings squad members. These resurrected warriors fought alongside her in their own Hellfire Incarnate forms, creating an unprecedented display of power in the Black Clover universe.
Her transformation into pure mana represents a fundamental change in her existence. Identical to how spirits function in the magical world, Mereoleona can now regenerate her physical form using mana. This eminence places her in a unique category among human magic users, as she has basically become a being of pure magical energy.
Also, whether Mereoleona survived in Black Clover after using Ultimate Magic has sparked a lot of debate. Unlike usual magical transformations that might result in death or permanent damage, her distinction seems to have formed a new state of existence rather than destroying her.

Her ability to uphold consciousness and control while in pure mana form means that she has found a way to surpass human limitations without sacrificing her identity. This development positions her as potentially one of the most powerful allies in the ongoing battle against Lucius and other major threats to the Clover Kingdom.
As such, the legacy of Mereoleona Vermillion’s triumph will certainly impact future developments in Black Clover. Her changeover via Ultimate Flame Magic and her ability to resurrect fallen pals mark a defining moment in the series. While her exact fate remains fully disclosed, her superiority in pure mana implies that the indomitable lioness has found a new way to surpass human limitations.