Cassandra, Bobby, and Dean all stood with their eyes glued to the TV screens on the other side of a shop's window while Castiel paced the length of the sidewalk.

"Reports are flooding in – a seven-point-six earthquake in Portland, eight-point-one in Boston, more in Hong Kong, Berlin, and Tehran. The U.S.G.S. has no explanation but says to expect a six-figure death toll," the voice from the TVs said as the images panned over cities left aflame, authorities scrambling to find survivors.

"It's starting," Castiel said.

"Yeah, you think, genius?" Dean snapped.

"You don't have to be mean," the angel replied, stopping. Cassandra looked up from the texts flooding her phone to see Dean staring at Castiel for guidance. She tucked her phone in her pocket and ignored all texts. They had bigger problems than people checking in on her.

"So what do we do now?" Dean asked.

Castiel nodded his head to the side, staring off into the distance at nothing in particular. "I suggest we imbibe copious quantities of alcohol... Just wait for the inevitable blast wave," he suggested. Cassandra scoffed and rolled her eyes, shaking her head. Dean scowled.

"Yeah, swell. Thank you, Bukowski. I-I mean, how do we stop it?"

"We don't," Cassandra chimed in. Dean turned to look at the Nephilim with wide green eyes. "Lucifer will meet Michael on the chosen field, and the battle of Armageddon begins. We're royally fucked."

"Okay, well, where's this chosen field?"

"I don't know," the two celestial beings chorused. Dean nodded, licking his lips.

"Well, there's got to be something that we can do."

Castiel turned back to the Hunter, tilting his head slightly and staring back at him with sad blue eyes. "I'm sorry, Dean. This is over."

"You listen to me, you junkless sissy – we are not giving up!" Dean roared. He turned to face Bobby who finally tore his eyes away from the screens and joined them, his gaze locked on the sidewalk. It was hopeless. "Bobby? Bobby?" The older Hunter slowly looked up, shaking his head.

"There was never much hope to begin with," Bobby admitted with tear-filled eyes, shaking his head. "I don't know what to do."

Cassandra looked up as she heard a faint whisper, glancing around with furrowed eyebrows. No one paid her any mind, too distracted by the TVs, sirens blaring in the distance, and their loss of hope.

"I told you that I was the only way."

"Come at me, you son of a bitch!" she screamed, holding her arms out as she stared at the sky. Bobby, Dean, and Cas all turned to her in confusion. Bystanders watched, automatically jumping to the conclusion that she was schizophrenic or something of the sort. "You want to try taking on the both of us? Give it your best shot!"

"Stull Cemetery. Lawrence, Kansas."

The voice died out and Cassandra's chest heaved in anger before she turned back to face Dean. A single tear slipped down his cheek when he realized that it had been Michael she was talking to. Cassandra walked forward and cupped his cheeks in her hands, pulling her boyfriend in for a kiss. Dean immediately kissed back before pulling away.

"Don't go," Cassandra whispered. "I got this. I'll fix this."

Dean opened his mouth to reply but before he could get out a single syllable she had already disappeared into thin air. Dean's face fell. She was going to get herself killed.

Cassandra landed in a patch of dead grass, tangled weeds consuming old graves off to her left. She glanced around, wrinkling her nose. Why would they choose this place to have their big battle? Why Stull Cemetery?

"Happy birthday."

The Nephilim turned to see her uncle stare at her with a smirk. Her heart clenched in her chest when she stared back into Sam's hazel eyes. They were no longer his. Eyes that had once been filled with compassion, love, and just a sliver of hope were now cold, evil, and murderous. Eyes that once belonged to a hero now belonged to a villain.

"I'm surprised you showed. I mean, I figured you'd be out with Dean celebrating. Twenty-seven candles, yeah?" Lucifer said. Cassandra crossed her arms over her chest and raised her eyebrows. Lucifer rolled his eyes—Sam's eyes—and shook his head. "Cassandra, your father will be here soon and I'm sure he'll kill you before he tries to kill me," Lucifer told her with a soft chuckle. Cassandra shrugged and started to walk, gently running her fingertips over the wooden crosses and deteriorating headstones that she passed by.

"Someone has to make sure you both die," she replied calmly, stopping just a few feet from the devil. She looked up. Her eyes were cold and hopeless. "And someone has to keep Dean and the rest of Humanity safe."

Lucifer chuckled and shook his head. "You actually think that you can stop us? Even with my Grace coursing through your veins you're still weaker than us, especially combined." Cassandra pursed her lips in thought and inhaled sharply.

"Back in Lincoln you declared me an enemy yet you still haven't killed me after being given chance after chance. I mean, that's what enemies do, right? Kill each other?" Lucifer pressed his lips in a thin line, remaining quiet at her words. Cassandra pointed a finger in his direction as she slowly approached him, trying not to let the fact that she was staring at Sam throw her off. "Or maybe you don't see me as an enemy. Maybe, unlike Michael, you weren't lying when you said you loved me. Maybe you realize that you actually do need me to survive this battle. Maybe, just maybe, the only reason you kept me alive back in Carthage was because you still had hope that I'd take your side."

"You're good at reading people, Cassandra. You should've become a therapist," Lucifer taunted. Cassandra smirked and shook her head.

"Yeah, well, Fate and Destiny had other plans for this abomination," she retorted. She circled around the archangel, studying him. "You're scared. I can practically smell the fear radiating off of you. You don't want to kill your brother, not really. But it's either kill Michael or spend another eternity in the Cage...or worse."

"You act so brave for such a fragile, little girl," Lucifer told her. "Maybe Dean's rubbed off on you more than you thought." Lucifer's lips curled into a smirk as he breathed in deeply. "You reek of his scent. Slutting around with him, I see. I suppose that isn't as awkward anymore now that he's not daddy's vessel."

Cassandra scowled and clenched her fists at her sides. She didn't reply, though, because the flutter of wings cut her off. She spun around, her expression faltering at the sight of Adam. But it wasn't Adam. Not really. She knew that it was her father in his skin. The thought sent rage-driven adrenaline pumping through her veins.

"It's good to see you, Michael," Lucifer greeted. Michael raised his chin slightly, nodding curtly.

"You, too. It's been too long. Can you believe it's finally here?" Michael asked, starting to approach his younger brother. Cassandra stepped off to the side and Michael glanced at her briefly but didn't pay her much attention. He wasn't there for her. Not yet, at least.

"No. Not really," Lucifer admitted. Michael nodded, almost as if he were agreeing.

"Are you ready?"

"As I'll ever be." Lucifer paused, sucking in a deep breath. "A part of me wishes we didn't have to do this." Michael nodded again. Cassandra could see the reluctance in his eyes and she almost felt sympathetic for him. Almost.

"Yeah. Me, too."

"Then why are we?" the devil questioned, slowly approaching his older brother.

"Oh, you know why! I have no choice, after what you did—"

"What I did?" Lucifer repeated in disbelief. "What if it's not my fault?"

Michael furrowed his eyebrows, cocking his head to the side. "What is that supposed to mean?"

"Think about it. Dad made everything. Which means he made me who I am! God wanted the Devil," he yelled. Cassandra locked eyes with Michael for a moment and she hardened her glare on him. Somehow she saw Lucifer's point. God was cruel enough to force this upon them. They didn't have to do anything. He wasn't there to guide or stop them anymore. He abandoned them.

"So?" Michael asked after a moment of silence.

"So why? And why make us fight? I just can't figure out the point."

"What's your point?"

"We're going to kill each other, and your daughter could die in the crossfire. And for what? One of Dad's tests? And we don't even know the answer. We're brothers. Let's just walk off the chessboard," Lucifer reasoned. Cassandra's eyes widened and her head snapped towards Lucifer in disbelief. He was defending her. He meant his words. He cared for her more than anyone else realized, but why? What was so special about the Nephilim that made the Devil had feelings? Was Sam breaking through the surface or was this purely Lucifer?

"I'm sorry. I can't do that. I'm a good son, and I have my orders."

"But you don't have to follow them."

"What, you think I'm gonna rebel? Now? I'm not like you."

"Please, Michael—"

"You know, you haven't changed a bit, little brother. Always blaming everybody but yourself. We were together. We were happy. But you betrayed me – all of us – and you made our father leave."

"No one makes Dad do anything. He is doing this to us." Lucifer's voice rose and he pointed to the grass for emphasis. Cassandra glanced between the two brothers in anticipation. Was it possible for Michael to change his mind?

"You're a monster, Lucifer. And I have to kill you."

Lucifer glanced at Cassandra over his shoulder, hoping she'd stand by him on this. She was torn between three sides: help Lucifer and risk the world going to shit; help Michael and give in to the one person who betrayed and killed her; or risk her life fighting the both of them and die bloody. She pulled out her angel blade and closed her eyes, running her fingertips over the blade. She felt the weight increase and the blade morphed into the sword that she carried back at Bobby's. She was grateful for Castiel's training.

"If that's the way it's got to be," Lucifer started sadly, his gaze locked on the ground. He slowly looked up, a murderous rage in his hazel eyes. "Then I'd like to see you try."

Lucifer and Michael started to circle each other while Cassandra stood off to the side, waiting to jump in, when the familiar revving of a car engine caught her attention. Their heads snapped in the direction of the gate and the blonde's eyes widened at the sight of the Impala. Dean was stupid enough to come.

Rock of Ages started to blast out from the Impala's stereo, drifting across the cemetery towards the three celestial beings. Dean cut the engine and got out, leaning against the car's door with a smirk. "Howdy, boys...and Princess." Michael, Lucifer, and Cassandra all exchanged glances. "Sorry. Am I interrupting something?" Dean slammed the door shut and started to make his way over to the brothers, directing his attention to Lucifer. "Hey. We need to talk."

Lucifer nodded with an amused smile, exchanging glances with his brother and niece before looking back to the Hunter. "Dean. Even for you, this is a whole new mountain of stupid."

"I'm not talking to you. I'm talking to Sam."

"You're no longer the vessel, Dean. You got no right to be here," Michael spat. Dean glanced over to the archangel, narrowing his eyes at him. Despite seeing Adam Milligan, he could still see the man who had killed his own daughter.

"Adam, if you're in there somewhere, I am so sorry," Dean said, his eyes soft.

"Adam isn't home right now."

Dean's gaze hardened again. "Well, then you're next on my list, buttercup," Dean replied, no longer sympathetic. "But right now, I need five minutes with him." He pointed to Lucifer.

"You little maggot. You are no longer a part of this story!" Michael roared.

"Hey, assbutt!"

Everyone turned towards the source of the voice to find Castiel holding a flaming bottle, Bobby standing behind him. Cassandra furrowed her eyebrows in confusion. Assbutt?

Before anyone could react, Castiel launched the bottle in Michael's direction and immediately the archangel caught fire, engulfed by flames. Dean stumbled back, leaning against the Impala as he shielded his eyes from the heat. Cassandra jumped out of the way, her lips parting in shock and her eyebrows rising when her father disappeared into thin air.

"'Assbutt'?" Dean questioned.

The angel's chest heaved and he shrugged, nodding. "He'll be back – and upset – but you got your five minutes."

Lucifer turned towards Cas with a murderous rage in his eyes and Dean gulped, glancing between the two anxiously. "Castiel. Did you just Molotov my brother with holy fire?" Lucifer inquired. Castiel smiled sheepishly and shook his head, his hands raised slightly as he stepped back towards Bobby.

"Uh... no."

"No one dicks with Michael but me." Without any warning, Lucifer snapped his fingers and Castiel exploded into a rain of blood and chunks of his vessel. Cassandra screamed out and went to lunge for Lucifer but Dean held her back, knowing that it'd only get her killed. She was blinded by anger and rage, something that always made her lose in a fight.

"Sammy, can you hear me?" Dean asked warily, still holding the almost-hysteric blonde in his arms. Lucifer turned back towards the two Hunters, scowling.

"You know... I tried to be nice... for Sammy's sake. But you—" Lucifer shoved Cassandra off to the side and she fell to the ground, smacking the back of her head against the Impala. She let out a yelp. "—are such a pain—" His gripped Dean's jacket, curling it in his fists. "—in my ass."

Lucifer threw Dean back onto the windshield of the Impala, the glass cracking from the force of his head. A gunshot rang out and Cassandra jumped, turning to see Bobby with the gun pointed at Lucifer. Blood poured from the devil's shoulder as he turned back towards the older Hunter only to be greeted by another bullet in the chest. It didn't phase him at all.

Dean stared at Bobby with wide eyes and he only shrugged, fear glistening in his own eyes. Lucifer looked down at the bullet hole before he twisted his hand and the echo of Bobby's neck snapping made its way to their ears.

"No!" Dean yelled out. Cassandra cringed, too focused on trying to stop Lucifer for her mind to register what had just happened and struggled to get up from the dirt.

"Yes." Lucifer grabbed onto Dean's leg and yanked him from the hood of the Impala. He landed a blow to his face, sending him back into the hood with blood dripping from his mouth.

"Sammy? Are you in there?" Dean choked out, spitting out some blood.

"Oh, he's in here, all right." Another punch. "And he's gonna feel the snap of your bones." Lucifer grabbed onto Dean's shirt and punched him again, letting him fall to the ground. Cassandra pushed herself to her feet, her legs wobbling slightly. "Every single one." Lucifer pulled Dean to his feet. "We're gonna take our time."

"You son of a bitch!" Cassandra yelled before letting out an ear piercing scream. Dean yelled out and clutched his ears but it didn't seem to faze Lucifer. The Impala's windows shattered but, still, Lucifer's expression never faltered. The Nephilim stopped, her eyes widening. Even her weakest scream had managed to take down Michael.

Lucifer flicked his wrist and the blonde flew back, crashing into a headstone. She groaned and grabbed the back of her head, pulling her hand away when she felt a warm, sticky substance run down the back of her neck. Her vision blurred and darkness threatened to take over but she fought through it. She had to get Dean out of there.

Lucifer returned to beating Dean, holding him against the side of the Impala and punching him a further ten times.

"Sam, it's okay," Dean said, grabbing onto Sam's jacket. His face swelled with every punch and it seemed to add on another layer of blood, still, still, he continued to get his ass kicked in hopes of reaching out to his brother. "It's okay. I'm here. I'm here. I'm not gonna leave you." His voice broke and he struggled to keep his eyes open but he never stopped. Lucifer landed two more blows to his jaw. "I'm not gonna leave you."

Lucifer brought his fist back, ready to land another blow, when a certain glint caught his eye.

Sam fought his way to the surface, memories from when they were kids up to the moment they were in now flashing before his eyes. Sam could see his younger self carve his initials into the Impala with Dean. He could see himself stuff the little green army man into the ashtray of the door. Sam could hear Cassandra's screams of frustration the first time he met her along with Dean's smirk as he watched her walk away, his gaze locked on her ass. He could hear her cry out in pain when Dean tackled her to the ground after her attempt of escaping and he could hear her sonic scream the first time she took down Michael, desperate to save the Winchester brothers. He could hear Dean's voice breaking as he opened up about his time down in Hell and he could hear their laughter from his goodbyes with the blonde.

Sam had managed to take over.

Cassandra used the headstone for support and pulled herself up, stumbling towards the two brothers as Sam staggered back, panting and catching his breath. Dean slumped to the ground, his head lulling.

"It's okay, Dean. It's gonna be okay. I've got him," Sam said, gasping for breath almost as if he were struggling to keep upon the surface. He dug in his front pocket and pulled out the Horsemen's rings, eyeing them before tossing them to the ground. "Bvtmon tabges babalon," Sam recited breathlessly.

The ground caved in and Cassandra made it over to his side, blood staining her pale skin. Sam neared the edge and breathed in deeply, bracing himself for the jump. The wind howled and whipped around his and Cassandra's hair and they exchanged solemn glances. This was it. This was the end. This was the end of everything they've fought for.

"Sam!" Their heads snapped towards Michael's direction. He was back. "It's not gonna end this way! Step back!"

"You're gonna have to make me!" Sam yelled.

"I have to fight my brother, Sam! Here and now! It's my destiny!"

Sam looked to Dean one last time and nodded, closing his eyes and spreading his arms out to fall back into the Cage.

Michael yelled out and gripped onto his arm but Cassandra raced forward, trying to pull him off. The Nephilim lost her footing and Sam's weight pulled Michael in with him, Cassandra following behind when Michael turned and grabbed onto her wrist. She fought to pull back but his grasp was too tight. It was too late. She was already gone.

Dean screamed out as he watched his two brothers and the love of his life fall into the Cage, still clutching onto each other as they disappeared into nothing. In a bright light they were gone, leaving nothing but the grass and the burning hot metal of the Horsemen's rings.

Sam and Cassandra were gone, and there was no getting them back.

So...that's it! That's the end of Monster. It took me one month and nineteen days to finish this story which, by the way, is five-hundred-twenty-one document pages unedited. Yep. So I'll post the stats in the Introduction and Copyright chapter and the finish uploading date.

So now comes the big question:

Do you want a sequel?

Or do you feel that this ending is good enough to end Cassandra's story?

I've been working on a sequel, and there won't be another after it, but I don't have to upload what little I have if you find that this story ended pretty good how it was.

Let me know in the comments! I look forward to hearing from you.