It sniffed the air, feeling... Heavier. Was there gravity in this section of the labyrinth? It was much harder to move. It was now making a clicking noise as it crawled up on the ceiling, as it's claws forced their way into the metal linings of the halls. It came upon a pile of rubble, similar creatures to what it had seen before scrambling in futility to scale the near vertical wall that had been made recently. Once again, it felt pity. At the same time... It felt hunger. It slowly crawled towards the group, attempting to take a bite out of one of the creatures, extending it's neck from the wall it clung to, meeting fierce retaliation. It's jaws, thin and small, couldn't even fit the creature's meat in it's mouth. That would simply not do. They turned to it, and it felt a form of... Unnerving. It was annoying, a filthy feeling that it wanted to go away. It stayed on the wall, out of the now ferocious and violent creatures' reach.
They scrambled and, much like how they tried to go up the wall, to follow this path, they now clawed in futility at his wall. He began to crawl back up to the ceiling, out of their lines of sight. Immediately it felt better, and millions of different solutions to it's eating shortcoming came to mind. It felt it's back quickly, finding large bone plates extending from it's spine. Perhaps... It could use something similar?
It's jaws began to grow, becoming large and fan-like, extending out wards from it's face, retaining the vertical slit of a mouth. Bone plates, sharpened at the tips, began to grow, in two rows, interchanging, one on the outside of it's jawline, one on the inside, like a zipper. It closed it's new jaws, letting out something akin to a purr as it's mouth closed naturally and perfectly. The new changes to it's jaw structure allowed it to open it's mouth with such... Force. Looking down, the creature noticed the... Pack, as it were, still focused solely on the wall that it had been on before. Such single minded creatures, apparently. Silently crawling behind a straggler, it's jaws came together with a pop, severing through flesh and carapace like a meat cleaver, and it engulfed the piece whole, moving for two more bites before fleeing once more.
Satisfied with this new evolution, it continued on it's path, eventually coming to a closed door. Trying to pry it open seemed to do nothing worth noting, and it couldn't get it's jaws in a position to exploit them. However, air ducts lining the ceiling and walls looked fragile enough, and a quick tug made that theory a fact, as it's claws ripped off the grate covering the large air shaft, quickly crawling into the cramped space. It's body became more narrow as it crawled, adapting to the new environment, and beginning to pick up the trail of those it had been following beforehand.
It could barely contain it's excitement as it looked down, seeing something leaning against one of the walls. It stuck to the shadows again, making no form of sound. Looking around the corner, it saw what could only be considered a monster. Jeez, the thing was MASSIVE. It was like something on steroids, then given steroids, that got ripped, then had more steroids.
Back to the hiding fellow, though. The creature just sat, waiting for it to make it's move, dark skin melded into the darkness, peering eyes looking down at the figure.