As they fly towards the battle, Finn and Marceline get an aerial view of the attack on the Candy Kingdom. They can see a ton of gigantic ground monsters as well as dragons. On the ground were trolls and an undead army. Arrows were flying everywhere and the Gumball Guardians were doing their best to hit the flying monsters out of the sky. Marceline positioned Finn over a dragon while trying to dodge the lasers from the Gumball Guardians. "Marceline!" Finn unsheathed his Demon Sword. "Release the Finn Bomb!"
She dropped Finn onto the back of the Dragon, where he proceeded to run his Demon Blade into its spine, while slicing all the way up to its head. At the very tip of the dragon's head, Finn jumped off to be caught by Marceline. Also in the air, Princess Bubblegum was picking off enemy forces with her arrows while riding Lady Rainicorn. A dragon was about to strike from behind her, but Finn had arrived just in time to decapitated it. "Princess, did you call for help from the UAO?" asked Finn.
"About five minutes ago!" Bubblegum yelled back. "Where are they!?"
"Bonnie, look out!" yelled Marceline. She pointed to her front and Bubblegum withdrew her arrow from her quiver and shot the incoming dragon in its eye.
"A LITTLE HELP DOWN HERE!" yelled Jake. He was on the ground, wrestling trolls as the rest of the Candy Kingdom is beneath him fighting the Lich's undead army. Finn motioned for Marceline to drop him on the back of the troll, and she complied. Finn unsheathed Scarlet and landed on the troll's shoulders, where he stuck both of his swords into its skull. Finn jumped off of the dead troll and readied his swords for the incoming swarms of enemies.
After dropping Finn, Marceline ascends into the skies and begins to morph into a large creature. When she impacts the ground, it creates a shockwave, killing all within its reach. Her large sharp fingers were able to cut cleanly through everything it came in contact with.
Within hours, the UAO forces had finally arrived, and the forces of the Lich began to dwindle down, from nearly 2,000 men to 1,000 and to eventually its final 100. And soon enough, the battle was over.
Finn was gasping for air, desperately searching the battlefield for his wife. "Marceline!" he called. "Marceline!" He looked at his ring, where the magnetite stone was pointing eastward. He rushed to what seemed like a large pile of dead carcasses and began to frantically dig for her. All of a sudden, her hand jumps out of the dead bodies, startling Finn. He pulls her out of the carcasses. "Marceline! Please be okay! Please!" Finn started tearing up.
He began to resuscitate her by blowing air into her mouth. "MARCELINE!" Finn was crying his heart out for her as he blew into her mouth again. "YOU CANT BE DEAD! MARCELINE-"
She began to cough and gasped for air. Finn was frozen in happiness. Oh thank gob she's alive! He thought.
"Finn…" was all she could say.
"Shhh… save your strength Marcy." Finn held her close.
There were a few seconds of silence, after which the head of a dead carcass had turned towards Finn. It frightened him, but he knew who it was.
"Give me your soul by midnight, and I will let your friends live."
Finn turned his head away and carried his wife in his arms to the Candy Kingdom.
He opened the doors to the castle, where the dead and wounded were taken. He laid Marceline down on a table, where the doctors would tend to her. He watched her, thinking that he should have stuck by her through the whole ordeal. She had awoken and stared right at him. "Marceline, I'm sorry. I should have stuck by you," Finn sobbed. "You got hurt because of me."
"Finn, it's not your fault," she said. "You need to stop beating yourself up. Not every bad thing that happens is your fault."
Finn nods back at her. "Well, I'm at least glad you are okay." He brushed the tears from his eyes. The doctor stepped in between them. "How is she doin, doc?"
"She seems to be stable. She didn't seem to sustain any major injuries. Just some minor cuts and bruises," Finn was relieved. "But she needs her rest though."
Finn nodded. He looked back at Marceline. "Finn, you should check on Bonnie and Jake," she said. Finn agreed and searched the castle for them.
The castle was packed with everyone from the Candy Kingdom. On the floor were countless bodies that had been covered by blankets. Next to those bodies were their loved ones. As Finn walked through, everyone stared at him, some with hatred in their eyes, blaming him for what had happened. The others were looks of plea, looking toward him wondering what they should do next. Finn knew the answer to that question, but it didn't involve the lives of the innocent to achieve. As Finn reached the end of the room, there was a group of people huddled around a single person. They made their way for Finn as he walked towards whomever they were looking at. He finally reached Princess Bubblegum, who hugged him immediately upon seeing him. "Oh Finn…" she sobbed.
"Who is it?" he asked. She held him tighter, trying so hard not to let him go. "WHO IS IT!?" he demanded. He finally broke free of her grasp and what he saw made him bawl. He knelt down next to the person lying down on the bed. It was his brother, Jake, had been killed in battle. He fell down on his hands, crying his heart out on the floor. He couldn't help but blame himself for the death of his brother. It's all my fault! My brother is dead because of me! This was all he could think about as he stared at his dead brother, crying.
For the next few hours, Finn did not budge from Jake's side. Marceline had woken up from her rest and floated towards Finn. She saw the reason why he was so upset and embraced him from behind. "Oh Finn…" She began to sob with him. She kissed him on the back of his head. "I love you." She kissed him again and again. "I'm sorry. I'm so sorry."
Finn gazed at Marceline and thought about how he would have done anything for her, for Jake, and for Bubblegum. He kissed her on the lips. "I love you, Marcy." He abruptly got up and started to remove his swords, laying them on an adjacent table. Bubblegum came up to Finn, as did Marceline. "What are you doing?" asked Bubblegum.
Finn looked at her with a facial expression that had the combination of anger and sadness. "I'm going to finish this." With that, he walked to the exit, where right before he opened the door, he felt Marceline's hand touch his.
"I'm going with you," she said.
"No Marcy. I need to do this al-"
"I promised you that I wouldn't leave you 'till the end, remember?" she interrupted. "Now I am going with you, like it or not."
Finn grabbed her hand with both of his. He caressed it gently. "Thank you, Marcy." She kissed him on the lips. They walk hand in hand towards the field where Finn is supposed to meet the Lich.
It's almost midnight, and the couple is in the forest next to the field. The couple began to reminisce about all the good times they had together, as they did when they first started dating. They talked about their jam sessions together, their first kiss, when Finn went through a lot of trouble to get Hambo. Everything. All of these memories made Marceline cry, and Finn, wanting so badly to console her, can't. They finally reached the field and looked at each other.
"Marcy…"
"I love you Finn. I always will, for all of eternity."
"I love you too. Always and forever." The embraced and kissed each other for a very long time, the last time. When they pulled apart, she laid a hand on Finn's cheek as he walked away. Marceline went invisible to observe what was next. She saw Finn take off his ring and set it inside his pocket and wondered why he would do that, but she knew she would find out soon enough.
Finn reached the center of the field. The field had nothing but knee-high grass on it and was outlined by the forestry, where Marceline was observing the scene. It was brightly illuminated by the full moon, which was huge tonight. Finn called out for his mortal enemy. "I'm here!" Out from the grass arose a familiar figure silhouetted by darkness. The only light emanating from this figure was the bright red eyes. The figure looked very human indeed. It stepped into the moonlight, and although the sight made Marceline shiver, Finn remained unaffected. Standing right before Finn was the Lich, who had possessed the decomposing body of Fionna.
"It's about time," it said. Finn could hear a double layer of voices, one was Fionna's and the other was the Lich's.
"You're going to pay for what you did," Finn said sternly. "To Flame Princess, Marshall Lee, Fionna, Simon, and all the pain you caused for everyone else. I swear, you will pay."
The Lich disregarded Finn's threats. "Now give me that body of yours!"
"Come and get it you fucking bastard!"
A cloud of black smoke arose from Fionna's decomposing body and shot straight into Finn. He could feel anger, hatred, and evil pulsing through his veins and for a moment, lost control. And then he thought of Marceline: her touch, her eyes, her hair, and her love. Finn could feel the power of their love battling back that anger and hatred pulsing in his body. The M that Marceline had scarred onto his sternum began to react, shining brighter than the sun. "MARCELINE!" Finn yelled at the thought of his lover.
"WHAT!? IMPOSSIBLE!" screamed the Lich from inside. Finn felt him trying to escape his body, but he was sealed in, for Finn had put the ring back on his finger just in time. "NO!"
Finn, with the little amount of control left inside his body, reached into his other pocket and grabbed the stone that Prismo had given to him. He threw it forcefully on the ground and a storm came from above them. The clouds swirled into a spiral, and Finn and the Lich were right in the eye of it. Lightning was flashing all around them, some of them even striking the ground at times, although nothing caught on fire. Up from the heavens, a beam shot down onto the hero and the evil entity. Finn gazed up at the blinding, yet somehow beautiful light and thought about Marceline's kiss and love before being evaporated into the beam. The beam retracted back into the sky and it was over.
Marceline rushed out of the forestry, screaming for her lover. "FINN!?" She knew she wouldn't find him, but she at least tried, hoping that he would still be there. Maybe something different happened? She thought. Maybe Gob spared him and just took the Lich instead? She wanted so badly to be right, but she knew she was wrong. She called for him again and again until she lost her voice. She searched desperately throughout the field, but Finn was nowhere in sight. Finally, she fell to her hands and knees and sobbed again like there was no tomorrow. The tears were a mixture of both happiness and sadness. She was going to miss her husband, but she was also proud of him.
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