The Demon looked at the seal. For thousands and thousands of years, he was trapped here, trying to break free. Take revenge on the one who banished him. Rip apart his creation, burning down the world. But just new companions reached here; escape was not possible. At least, for now. He could feel the ancient spirit powering the abyss fading. Abbadon, the great being created and sacrificed to build an eternal prison for those opposing god. Even with all the might of a fallen star, he could not budge the mighty walls of this pocked dimension. He was trapped between worlds, and with him were his brothers in arms, beings not half as great as him but still more powerful than their kindred in heaven.
They were banished for the greed of being equal to their master's other creations, being seen by him and not just some underlings, bowing before the words of less powerful creatures, crawling on an earth they don't deserve after betraying the trust of him, whose words shall not be taken lightly. To speak the truth, he was not innocent in this betrayal, at least a part of him. He was the one giving the lesser beings the knowledge they wanted. He was the one who helped them reach something their god would never allow them to get. And for that, he, the first servant of his master, his most glorious, his morning star, was banished for all times. But those lesser beings, way younger, way less faithful than him, were forgiven.
But now, with the end of Abbadon, the abyssal reincarnation, their end grew closer and his time to shine again, to burn everything in his radiance, did so too. Just thinking about it made him happy and fuming at the same time. With his gigantic hand, he grabbed a few lesser demons, circled his monumental head, and smashed them, just to feed his desire to destroy. Here, they couldn't die, couldn't be killed, for nothing can save you when you are trapped in the abyss, not even death itself. His roar shook the flaming walls, and thousands of voices answered as he, once again, rose from his shackles. Gigantic flames spread from his body, lava dropping down like sweat. His hands turned into claws; his eyes turned into a deep, emotionless black as he reached out, grabbing the tiny cracks in the seal. The smaller, less powerful demons shrieked as they flew upwards but were soon driven away by the mightier ones.
The fiend glared at his servants.
There was the goat-headed Baphomet with the marks of man and woman alike and four arms. The gigantic Leviathan, a monster of the sea, big enough to eat ships with one bite. Acephalous, the great headless man whose skin was covered with fur and scales alike. And Samael, his first brother, the one who stood at his side from the very beginning. A black scarf covered the empty sockets of his eyes, ripped out by a Seraphim, while out of his back, two crippled wings formed their way into the burning air. His ink-black skin moved in waves as he made his way upwards. He may not seem as dangerous or mortifying as the others, but he was by far the strongest of them, and none tried to block his way.
With a mighty roar, the burning claws ripped apart the seal, just for a mere moment. And thousands of his kindred flew out of the abyss before its power smashed the others back to the ground. They were flattened by the sheer might of the seal, smashed flat on burning stones and spikes, ripped apart by a chaotic surge of wild magic. Bones broke, flesh ripped off. And still, the creatures laugh. For the first time in thousands of years, some of them were freed. A sign that their seemingly eternal punishment was going to end. And while their bodies and minds were broken, they still were more thrilled than at any other point in their pitiful existence.
At some point in the pain, the consciousness of the great Demon faded, and another took over. His skin turned into chitin as an insect-like shell covered his insides. Two antlers broke out of his skull, twitching around as they sensed his surroundings. His children formed a group around him. It looked like they were praising him or protecting him from an enemy only they could see. With a tremendous amount of strength, he lifted himself from the ground. His damaged body was just capable of performing this act without breaking apart, but as soon as he set his feet on the ground, his children swarmed upon him, covering the wounds, assimilated with him. And so, the damage was healed in seconds. He lacked the sheer size and strength of his first form, but still, he was father and king to billions. They couldn't break the seal again like his first from, but they could slowly nibble away its magic and strength.
And so he raised his arms. Sharp, curved fingers were pointing at the glowing seal. And the ground followed him. A cloud of infinite beings flew upwards, breaking free from stones, walls, demons, and even his own body. They were more than enough to blacken the lights. The endless stream of bodies washed against the seal, and with every body hitting it and getting smashed by its power, the seal weakened. Just a tiny, unnoticeable bit, but it weakened. Burned shells popped open as his children were burned and electrocuted. They fell back from the skies, but their numbers seemed not to dwindle. And then, as soon as it started, it was over. No more Insects flew up; nothing heard his call to attack. And so, he turned back into himself, to sleep, reproduce, for now, and another mind took over the body.
His skin changed again. Chitin was absorbed into him, turning into pale, white flesh. A pair of black wings broke from his shoulders while he shrank in size. Hair grew out of his skull, black and matted. His eyes turned from the broken vision of a fly to human eyesight. The Iris was a mix of yellow and red. Sharp teeth broke out of his mouth, and a pair of bent horns broke through the skin of his forehead. As the transformation ended, a beautiful but scruffy man arose. He rose his hand and looked down on it. Black, claw-like nails grew out of them. His legs and feet were those of an animal, ending in paired hooves. He hadn't been in control for so long; his movement felt dull and slow. But still, he was probably the most powerful of his three minds. And as he reached for the seal, black flames thrust up, trying to consume the broken parts, licking at the cracks. But the fading power of Abbadon was still too strong to be taken apart by this, and so a great stream of energy smashed into him, smashing him to the ground again.
As he lay there, his arms and legs spread at strange angles, he had time to think. When he broke free of his prison, what would he do? Who would he kill, how many? How would he kill them? Their screams should be the music to his rulership, but what tone should they sing for him? And more importantly, he was three, but there was only room for one on the throne. And every part of him wanted to be the ruler, the one who holds unlimited, ultimate power. So how could he defeat his two brothers, his two other selves? Burning rage and a gentle, greedy father of many, both formidable opponents, both strong in their own way, maybe as strong as he was himself. But still, they were once one until they were smashed from the heavens. His eternal punishment, to be one but nether truly a single being, always in a fight with himself, always trying to grasp control, just for a moment, while holding back his other selves, true hell. But he had many, many years to prepare, and now, his plan slowly came into motion.