First, the story of opening up the place where the monster rests...
He had cleared out most of his hidden reserves, and had almost forgotten about this one. Caliwick could feel the Evil pulsing from within this tomb - this was a rare time where time had been kind, it seems. Something else was in the air as well - Hatred? Wrath? Whatever that dark emotion was, it had POWER. The necromancer smiled. A fine creation lies within this stone.
As he opened the stone wall that sealed the Evil creation within, Caliwick felt something push back against his breaking of the seal. This... Concerned him. His other caches had protections, but they hadn't fought HIM. Perhaps this tomb had consumed much of the ambient Evil his demonic master was giving off, and his wards had turned against their creator? Yes, that was it he decided, and continued to open the solid tomb.
An unnatural darkness greeted Caliwick, and though he had put it there himself, something was... wrong. Two blood red orbs lit up in the black, and Caliwick knew then that HE had made those wards so aggressive.
The beast that was coiled within was one of his earliest and greatest experiments... And also his most volatile. The Oroboros - Half snake, half human, with honeyed, forked tongue, and toxic fangs and claws. Most dangerously, though, a hunger for flesh that could leave a nation empty. It needed no food to sustain itself, as it was mostly undead, undying. But its mind was sharper and crueler than in life, and it used its undead physiology to slither in pursuit of its prey, breathless, tireless, silent as death.
It was Caliwick's proudest moment and greatest regret. And as the beautiful monster slid up to him and flicked its tongue across his cheek, he remembered with a flash of fear that he never could quite control this one.
"Hm... One of usss now?" it hissed. "And I sssmell my new massster on you. Ssshame. I had hoped to rip you to ssshreds with my enhanced form..."
Caliwick realized the two arms wrapped around his left side, stroking his spine with those needle-like claws.
"Oh? Sssuprised by how I've changed?" The Oroboros says, a smirk on its thin lips. It slides back and opens its four arms, basking in its own glory.
Indeed, the beast had taken to Klx's form somehow, with another set of arms connected in an impossible way, and its full form covered in scales, save for it face. It had retained its grace, even improved upon it, somehow having removed the scars of the magical and surgical fusion of flesh.
It was a glorious nightmare given physical form.
It turnsss out that Evil isss a MUCH finer delicacy than the living." the Oroboros said, tasting the air. "Now I'm off to find the sssource of this deliciousss darknesss..."
Caliwick blinked as the snake-thing slithered into the distance. He knew what that beast was capable of. And he knew he couldn't stop it. And he feared that if his demonic master let his guard down for even a moment, the Oroboros would swallow him whole. He stood, frozen, for what had to be an hour, before he dared to breathe again. Perhaps he had uncovered enough graves for today.
...And FIN!
I also have a more describy description complete with an explanation of the creation ritual and notes from Caliwick's notebook... Just gotta find the time for that too.