Nexus Academy Series by Callie Madden

Four immortal warriors. One human girl. A prophecy that will either unite Heaven and Hell. .. or destroy them both. When Celine's moment of compassion triggers ancient symbols to burn into her palms, the worldwide blackout that follows isn't an accident—it's an awakening. Suddenly, the museum clerk who sends every spare dollar to her disabled father becomes the most hunted human on Earth. Four immortal warriors felt her awaken across dimensions. Four bonds that will either claim her. . moreFour immortal warriors. One human girl. A prophecy that will either unite Heaven and Hell. .. or destroy them both. When Celine's moment of compassion triggers ancient symbols to burn into her palms, the worldwide blackout that follows isn't an accident—it's an awakening. Suddenly, the museum clerk who sends every spare dollar to her disabled father becomes the most hunted human on Earth. Four immortal warriors felt her awaken across dimensions. Four bonds that will either claim her. .. or destroy them all. Dominion - The ruthless angel commander whose military precision crumbles the moment he sees her. He failed to protect someone once before. He'd rather die than fail her. Zorrander - The ancient demon lord who's waited millennia for this moment. He planned to guard her from a distance. Instead, he can't breathe when she's not near. Gideon - The brutal half-angel who despises his human blood—until training her to survive means accepting the humanity he's spent lifetimes trying to kill. Lynx - The predatory young demon who came to corrupt her soul. Now he'd slaughter armies to keep her safe, and he doesn't understand why. Dragged to the gothic Nexus Academy where angels and demons coexist in barely controlled hostility, Celine wants nothing more than to return to her quiet life. She never asked to be anyone's prophesied savior. But the bonds won't let her leave—and neither will her four guardians, who are bound by cosmic law to protect her whether she wants their protection or not. The problem? Something older than Heaven and Hell is hunting her with ancient patience and unlimited power. The First Shepherd has been dormant for millennia, waiting for the prophesied key to awaken. Now he's rising, and he'll burn down the entire world to reclaim what he believes belongs to him. Every human who falls to his stone armies, every soul he strips of free will—it's all to flush out one terrified girl who just wants to go home. Some prophecies are written in starlight. Others are carved in blood and desperation. A dark academy why choose paranormal romance where four dangerous immortals discover that protecting their human might be the most terrifying battle they've ever fought—and the only one that matters. less

When the people you trust most are the ones who hurt you, how do you learn to trust again? The supernatural bonds that connect her to four powerful guardians—the calculating angel Dominion, the lethal hybrid Gideon, the chaotic demon Lynx, and the ancient Zorrander—were supposed to protect her. Instead, Celine discovers that good intentions and impossible choices can wound deeper than any blade... moreWhen the people you trust most are the ones who hurt you, how do you learn to trust again? The supernatural bonds that connect her to four powerful guardians—the calculating angel Dominion, the lethal hybrid Gideon, the chaotic demon Lynx, and the ancient Zorrander—were supposed to protect her. Instead, Celine discovers that good intentions and impossible choices can wound deeper than any blade. The betrayal wasn't meant to destroy her, but it did anyway, leaving her questioning everything she thought she knew about loyalty, sacrifice, and the price of being humanity's Key. As she struggles to rebuild herself, the academy fractures around her. Students and faculty choose sides, some viewing her as humanity's savior while others see her as a dangerous corruption that threatens everything they've sworn to protect. But darker forces are moving within the shadows—ambitious factions with their own vision for the future, and not all of them include humanity's survival. Every alliance comes with a price, every friendship carries the risk of another betrayal, and Celine finds herself isolated even among those sworn to protect her. Meanwhile, the First Shepherd has been hunting. While she withdrew into herself, he painted the country in blood—cities silenced overnight, families erased without trace, massacres so brutal they redefine the meaning of horror. Each attack carries the same Come to me, little Key, or watch them all burn. When the academy's betrayals collide with the First Shepherd's escalating violence, Celine discovers that some enemies prefer to work from within. Now she must navigate treacherous alliances and question every loyalty, all while racing to stop an ancient evil who has grown far deadlier than anyone imagined. The hunt is on. And this time, the fate of every human soul hangs in the balance. Some bonds are forged in battle. Others are broken by impossible choices. And some enemies hide behind familiar faces. less

I finally have everything I've ever wanted—four incredible guardians who love me as fiercely as I love them. Too bad an ancient god just decided to make me his muse. The bonds between us have never been stronger. Dominion, Zorrander, Gideon, and Lynx are finally mine completely, and the heat between us could set the world on fire. But the world is already burning. Plastos the Creator—one of humanity's original architects—has returned to restore his "artwork" to its perfect design... moreI finally have everything I've ever wanted—four incredible guardians who love me as fiercely as I love them. Too bad an ancient god just decided to make me his muse. The bonds between us have never been stronger. Dominion, Zorrander, Gideon, and Lynx are finally mine completely, and the heat between us could set the world on fire. But the world is already burning. Plastos the Creator—one of humanity's original architects—has returned to restore his "artwork" to its perfect design. Cities reshape into geometric nightmares. Humans are carved into living sculptures. And he's obsessed with me as the ultimate corruption that needs his personal touch. He doesn't want my cooperation. He wants my blood, my bones, my pain. I’m the lynchpin in his ultimate spell. While my guardians tear through dimensions trying to find me, I'm strapped to a marble altar being systematically broken and healed and broken again. But it’s time I realize my true power. Because I'm not the Key that unlocks his apocalypse. I'm the Key that breaks it. Dominion—my fierce battle angel whose protective fury now burns hotter than divine fire. Zorrander—my ancient demon lord whose careful control shatters beautifully when it comes to me. Gideon—my brutal nephilim whose devotion runs deeper than his pain. Lynx—my predatory demon whose territorial nature has evolved into something devastatingly possessive. They've claimed me completely. But claiming me and keeping me alive are two very different things. Some sacrifices save the world. Others just make you a target. less

They survived the first Primarch. But the real war is just beginning—and the enemy is already inside their heads. After defeating one ancient evil, Celine thought she'd earned a moment to breathe. To heal. To finally explore the bonds connecting her to the four supernatural warriors sworn to protect her. She was wrong... moreThey survived the first Primarch. But the real war is just beginning—and the enemy is already inside their heads. After defeating one ancient evil, Celine thought she'd earned a moment to breathe. To heal. To finally explore the bonds connecting her to the four supernatural warriors sworn to protect her. She was wrong. Supernatural beings are dying across the globe—demon lords murdered in their strongholds, angel commanders vanishing without a trace, entire Nephilim families slaughtered overnight. The message is the remaining Primarchs are hunting those who would stand against them, and nowhere is safe. As panic spreads and refugees flood Nexus Academy seeking protection, old rivalries dissolve in the face of extinction. The academy becomes a supernatural last fortress, packed with warriors ready to make their final stand together. But Celine can't shake the feeling that something is desperately wrong. Her guardians are acting strange. And when the battle arrives, she realizes the true enemy isn't at the gates. The enemy is wearing familiar faces. Now Celine faces impossible choices with only her instincts to guide Who can she trust? Who has she already lost? And who will she have to betray to survive? Sometimes the most dangerous enemy is the one who knows exactly how to break your heart. less

They were bonded to protect her. Now she must save them. Celine has lost everything. Her guardians are scattered—one imprisoned, one trapped in Hell, one consumed by darkness. The bonds that once tied her to four powerful protectors have become her greatest vulnerability. And her enemies know it. With ancient forces hunting her and the Severance Protocols threatening to tear away her last connection to the men she loves, Celine must become something she never imagined: a leader. A fighter... moreThey were bonded to protect her. Now she must save them. Celine has lost everything. Her guardians are scattered—one imprisoned, one trapped in Hell, one consumed by darkness. The bonds that once tied her to four powerful protectors have become her greatest vulnerability. And her enemies know it. With ancient forces hunting her and the Severance Protocols threatening to tear away her last connection to the men she loves, Celine must become something she never imagined: a leader. A fighter. A threat. Because the only thing more dangerous than a bonded Key. .. is one with nothing left to lose. less