I do not own Adventure Time or any of the characters.
Finn vs Chaos
"Ah at last. Shall we begin?"
Finn stared at the geyser of blood as something stepped out of it. It looked like a three dimensional silhouette, as it had been in the dream, but as the blood geyser died down, the figure, the thing that had been haunting Finn's dreams, began to change. His skin began to lighten and solidify. His glowing red eyes dulled a little. Then, shadows exploded off of him and the world around them went dark.
Finn felt himself trembling as he stared at the creature now standing before him. It stood roughly seven foot tall, with thin, lanky arms and goat legs, rotting grey skin, completely red eyes with black vertical slits for pupils, slits for nostrils, pointed teeth, six inch long claws, and a set of bloody, cracked and chipped ram's horns. Blood trickled down from the monster's teeth and fell to the ground. Finn raised his sword and watched it shake in front of himself.
"You're afraid," the monster sneered. "Good. Do you know what I am? I'm a demon. And not just any. I'm the Lord of all Demons. The oldest and strongest of them all. I...am Belial."
Finn gulped, then sprinted forward. Belial laughed, the sound echoing off the air, deafeningly loud and horrifying. When Finn reached Belial, he slashed at him horizontally and one of Belial's hands used its claws to flick the blade away before the other flashed out, slashing Finn shallowly across the stomach, throwing Finn back. Finn landed on his back and Belial appeared over him. Belial drove his claws down into Finn's abdomen. Something thick and black began to spread over Finn's body, burning as it went. Finn shrieked in pain, kicking out. One foot met with Belial's knee, snapping it backward and Belial staggered back, claws ripping free of Finn's body. Finn stood, and the black substance began to run off of him and out of his wound. Belial growled in annoyance, his leg snapping loudly as it returned to its original position.
"You're beginning to annoy me, human," Belial growled. "Take care not to do that."
Belial streaked forward again and Finn slashed. Belial streaked around him, stopping on the other side, a gash in his stomach. Finn spun, slashing again only for Belial to catch the sword with his claws and stab Finn again. There was no black substance this time, he simply drove his claws almost completely through Finn's abdomen. Finn staggered backward and Belial followed, claws tearing into him rapidly. Finally, Finn collapsed and Belial stopped over him, staring down at the bloodied and almost unrecognizable Finn.
"You're not as capable as I thought," Belial growled. "Shame. Still. The smell of your blood should bring the half-blood bitch running. And then she'll be mine."
Finn sat up and, in one fluid motion, drove the grass sword into Belial's stomach, grass blades sprouting from a dozen other spots on Belial's body as well. They retracted and Finn pulled the sword out, using it to stand as Belial collapsed.
"You will not touch Marceline," Finn growled. "I won't let you."
Belial's wounds healed and he floated to his feet, grinning wickedly at Finn. Then, he kicked him. Finn sailed backward, feeling several cracked ribs, then crashed down hard on his back. Finn pushed himself up as Belial leaned forward and charged on all fours. Finn turned in time for a ram's horn to impale him through the stomach. Finn brought his sword upward, removing the horn from Belial's head, making Belial shriek in pain and rage. Then, Finn stumbled forward, slashing wildly as Belial was distracted. Belial roared in rage as Finn's sword tore his torso open again and again, his blood splattering across the ground along with Finn's. Then, his claws caught the sword and his wounds healed.
"You...human...have made a very grave mistake," Belial snarled. "You've made me mad."
He pulled his arm back, slashing. However, before his claws could reach Finn, a cloaked figure appeared in front of him, holding up a gilded crucifix. A blinding light shot out and Belial howled in agony before disappearing in a cloud of smoke.
"This isn't over!" Belial's voice raged from all around them. "You've barely bought yourself a day! I'll still get what I want!"
With that, the crucifix exploded into melted metal, splattering across the ground. Finn collapsed, vision swimming as the figure turned. However, Finn's vision was too blurry to make out their face, and he couldn't hear them as they tried to call out to him. Finn had failed. Belial was too strong Finn had never stood a chance. And there was no way he could stop him. Not now. Finn probably wouldn't even survive the day they had to rest. Marceline was going to die. There was nothing he could do about it.
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