Disclaimer: I don't own anything except the character Knull and this story.

Characters and series belong to respective owners

This story is inspired by the story "BreakThrough" by NarutoPlug

Chapter 1: War and Betrayal

The civil war in the Underworld has finally ended, the Old Satan Faction has been defeated and forced to retreat. Currently, the leaders of the Anti-Satan resistance are celebrating their victory, before returning to the capital. Sirzech Gremory laughs as he walks back to the camp. Walking next to and conversing with him is a young man with a mane of shaggy, black hair and violet colored eyes. This is Knull Bael, Sirzech's best friend and blood brother. He is dressed in a black jacket, with a fur-lined collar and black pants.

"I'm telling you Sirzech, the first thing I'm going to do when we get home is have a, ice cold beer and a hot meal."

Sirzech laughs, "Count me in."

"By the way Sirzech…you sure about marrying Grayfia?"

Sirzech smiles, "I am, I love her so much." He turns to Knull, "And I expect you to be my best man."

Knull throws his arm around Sirzech's shoulder, "I wouldn't miss it for the world."

The two friends laugh as they finally reach the camp.

Knull yawns as he enters his tent and removes his jacket, exposing his tattooed torso, "Aw man, I'm beat."

Before he can get ready for bed, however, he feels a pair of arms wrap around his torso and a woman's naked chest press into his back, "I hope you're not too tired, my love?"

He smirks as he turns around and pulls his lover into his chest. Serafall Sitri, heir to the Sitri Clan and Knull's longtime lover. "I'm never too tired for you."

Serafall smirks and pushes him onto his bed, "Good, cause I'm feeling quite energetic."

Knull flips them over, so that he's on top and kisses her, their tongues wrapping around each other and fighting for dominance.

"The things I do for love."

"Shut up and make love to me."

After all the partying, the two lovers initiate their own private celebration; a long night of passion.

The next day, they all enter the capital, where everyone is waiting. All the citizens cheer them on as they walk through the city. The other heroes are greeted by their parents and families. Knull simply stands back and watches, his parents having died when he was very young. Sirzech turns to him and waves him over. He smiles and walks over, Venelana and Zeoticus smiling at their adopted son. Sirzech found Knull on the streets as a kid and introduced him to his parents. Venelana, being originally from the Bael Clan herself, was more than happy to take in a fellow clansman with nowhere to go.

"Cheers!"

Sirzech, Knull and Zeoticus all thump their glasses together, and then start chugging their drinks, while Grayfia and Venelana shake their heads and sigh.

Knull smirks, "So Sirzech, when can we expect the wedding?"

"Yes, my son, and when can I expect grandkids?"

Sirzech and Grayfia both blush heavily, while Venelana giggles in amusement.

Sirzech smirks in response, "Oh yeah?" "Well what about you and Serafall?"

Knull chokes on his drink, "Oh shut up."

A few months later, and Sirzech is getting prepared to be coronated as the new Lucifer. Sirzech paces back and forth, while Knull watches on.

"Oh, I'm so nervous, what if I mess up?"

Knull rolls his eyes in response, "Will you calm down, Sirzech?" "You'll be fine."

They hear a knocking on the door and one of the maids sticks her head in.

"Apologies for the interruption, but Lord and Lady Sitri are here to see you Knull-sama."

Knull and Sirzech share a look of confusion, "Lord and Lady Sitri?"

Knull walks over to where his future in-laws are waiting, "Is there something wrong, my lord and lady?"

Lady Sitri sighs, "I'm sorry for the sudden intrusion, Knull, but it's important."

Knull shakes his head, "It's alright, is something wrong with Serafall?"

Lord Sitri shakes his head, "Serafall is fine, it's about your engagement."

Knull arches an eyebrow, "Is there a problem?"

Lady Sitri frowns, "I'm sorry Knull, but we can't allow the two of you to marry."

Knull's eyes narrow, "Come again?"

Lord Sitri puts his hands up, "Please don't misunderstand." "We know you love our daughter, but you aren't the one for her."

Lady Sitri nods in agreement, "Serafall is going to be the new Leviathan, and she needs to be with someone more of her standing."

Knull stands up, "So in other words, you two worthless sacks of shit care more about your image than your daughter's happiness."

The two clan heads' eyes widen in shock, but before they can protest, Knull continues.

"Let's get one thing straight, I love Serafall and she loves me back." "The only way that you'll get me to leave is to kill me." "And let me give you some advice, you better a bring a fucking army!"

With that, he turns and storms out, leaving a shocked and bewildered Lord and Lady. He decides to take a walk that night to clear his head. He stops and glares over his shoulder to see a small group of Sitri Clan members glaring back at him.

"So…they've made their choice?"

He senses another presence and looks to his right to see a group of Bael Clan members.

"So, the old prick wants me gone too, not surprising."

"Don't fight back Knull-sama."

His eyes widen as he notices a group of Gremory Clan members.

"What is this?"

"I'm sorry Knull-sama, but Lord and Lady Gremory have deemed you to be a threat."

Knull growls, "Is that so?"

One of the Sitris sneers, "Lady Serafall has also washed her hands of you."

He grits his teeth and whips his head to the Sitris, "You lie!"

The Sitri smirks, "She has chosen her duty to her family over you."

Knull's eyes are shadowed as they begin laughing at him. When suddenly, he gives off an insane smile, with blood running through his teeth, silencing the laughter.

"So, in other words…you've all been sacrificed."

The Power of Destruction begins pouring out of his body, causing the surrounding devils to begin sweating in fear. At the palace, the coronation is about to begin, when the entire city shakes.

"What was that!?"

Ajuka notices something outside, "Look!"

They all turn to see a massive pillar of black energy shooting into the sky. Serafall gasps in shock, "That's Knull's energy!"

All that is left of the area where Knull is located is a massive crater. The bloodied and battered bodies of the devils are strewn about. As his power dies down, he looks around in disgust.

"Pathetic."

Before he can take a single step, a massive magic circle appears beneath him, "What!?"

He notices one of the devils is still alive and is the one who activated the circle. He coughs up blood, before activating the seal.

Chains burst from the ground and wrap themselves around Knull's body, sapping his energy and hindering his movement. The energy circle glows brightly, before the light disappears, and Knull along with it. The surviving devil chuckles, before he finally succumbs to his injuries and dies.

All that is left of Knull is the necklace that Serafall gave to him.

End of Chapter 1