The Kothoga

The Kothoga is the main antagonist of the 1997 sci-fi horror film, "The Relic." It is an ancient creature which is born when either a human or animal consumes a fungus with mutagenic hormones, and subsequently can only survive by eating said fungus or human hypothalamus which contains the same hormones. It's used by a South American tribe against anyone who is deemed a threat to their people and is also viewed as a guardian by them. This version of the beast in particular being an anthropologist by the name of John Whitney, who secretly ate the fungus laced with it by the tribe and now stalks The Museum of Natural History for prey; residing in the sewer system and coal tunnels underneath the complex after returning.

Despite originally being human, the Kothoga has completely lost all humanity and is now a carnivorous and feral monster driven by the desire to survive by consuming hormones in either the hypothalamus of humans and/or vertebrate creatures, or fungus that acted as the source of its current form's powers. Though due to due to its human self's intelligence means that it is also somewhat cunning, being able to recognize traps or hide bodies as well as stalk its prey.

The Kothoga is a chimeric creature combining aspects of fish, lizards, big cats, and insects. Its body is quadrupedal with a sloping back. Its backside is covered in muddy green crocodilian scales and its underbelly has scales that are a pale flesh tone. A row of spines runs down its back, as well as a dark brown main on the back of its head and another mane at the base of its thin but muscular tail. The Kothoga's head has two very small glowing white eyes, exposed gums, anglerfish-like teeth, and two pairs of tusks/mandibles (a large one and a smaller one below the larger one) resembling those of insects.

The Kothoga doesn't really have any "likes" due to being a primarily instinctive beast, so the only things that somewhat qualify are consuming the human hypothalamus or fungus which created it.

Losing any potential prey.

Sharp tusks

Prehensile forked tongue

Massive claws

Powerful tail

Thick, scaly hide which is nearly impenetrable to bullets

Enormous size

Wall crawling

Senses

Superhuman strength, speed, and stamina

10-15 feet