Mixels Ghost-Gaiden; Gammamon's Solo Adventure! Take back the Hidden World!

Prologue- Dawn's Nightmare and Celebration hold Bitter Omens of the Future

Blackened Nothingness.

All that there was within this abandoned city of advanced technology was darkness with not even a singular visible sight underneath the domain's darkest sky. All that could be seen despite the infinite void was a conspicuous number of endless chains that seemed to shine with a bright and eerie yellowish-green glow with one singular multicolored eye consisting of blue, purple, yellow, pink and green, that was standing atop of a singular tower. However, this being wasn't on its own, as what appeared to be a Draconic creature's wings could be heard loudly flapping to keep its body airborne in the shadowy horizon, staying rather close to the being who was binded by the chains that were attached to his body. "A shame that the robot was unable to prove its worth. But nonetheless, we won't need to seek them out anymore. Those two Legends thought they could continue hiding from our sights within this city forever, but it's clear as day that they've underestimated us, and what we can truly do." The being attached to the chains told the dragon-like creature, who knew what the chained being's command was without as much as a single word being uttered, as it took to the muddied skies, letting loose a raining barrage of shining red arrow-like lasers, destroying and decimating every last piece and corner of this mysterious, darkened city, as well as all of the other beings who were currently in it, be they alive or not, as the chains that were constricting the body of the other being all broke off into splintered shards of metal, as a Purplish-blue vortex that appeared to somewhat be in the shape of a star faintly lit up the endless darkness around it, as the duo consisting of the once-chained creature and the draconic being went through it, and the illuminance from the starry-shaped vortex lit up the city, revealing the once-grand city to now be reduced down to nothing more than just large piles of endless rubble, as well as a multitude of bare skeletons and two cracked gems- One a Ruby, and the other a Sapphire. But amidst all the destruction, there was one thing standing out above the other bones and broken gemstones and building structures-

A skull that resembled a Triceratops', that seemed to faintly glow with both bright orange and yellow lights.

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~Waking World~

"UWAAH~!" Gammamon Squeaked loudly in fear, jolting awake from his small little bed that Casey had so generously made for him the day they got back to Earth from Neowise, after defeating his father, Regulusmon, who betrayed the Nixel Armada, and had managed to not only Digivolve into his Mega-level form of Arcturusmon, but also had created copies of his human partner's Mixel partners, the Infernites, forged from nothing but his own Poison that he utilized to infect and devour The homes of his Mixel friends, the Digital World, and multiple other worlds- A type of poison known as the GRB (Short for Gulus Realm Burst)- and the copies of those fiery Mixels were known only as the Shadownites. "Ohh~? So, that strange thingy that I saw earlier was just a scary nightmare..." He told himself, beginning to calm down, as a blackened, taller version of himself with a harpoon-like tip at the end of his tail and blue cape that seemed like it had been torn along the ends walked into the room. "'Ey, lil' bro. Ya a'ight? Casey 'n the otha's heard ya screamin' fr'm downstairs, an' they told me t'come and check up on 'ya..." This was none other than Gulus Gammamon- Or as he was more commonly referred to as by his allies now, Gulus- Gammamon's older Brother. You see, in the past, Gulus had been sealed within his little brother's body as a workaround to the little Digimon being able to live a normal life, despite Gammamon being born with a fractured digicore. However, when Gammamon first let Gulus loose by Dark Digivolving, Casey and the others saw that he was nothing more than a cold-blooded killer that Gammamon had constantly referred to as his own 'inner demons'... Or at least, that's what everyone else thought Gulus was. Soon enough, Gulus had ended up becoming an invaluable ally to the team in do-or-die situations, who even helped them take down the insane Digimon that viewed himself as a god that was Arcturusmon, and also managed to leave his little brother's body for good in order to seal the Shadownites within him by using the raw power he alone had inherited from Arcturusmon as a Devourer. Nonetheless, even though he had caused a fair amount of digital murder in his past, Gulus would do anything he could for Gammamon- All if it meant keeping his little brother, the only person left alive in their bloodline, safe from any kind of harm.