Kraken

The Kraken is a vicious species of animal that lives underwater. These semi-sentient creatures are massive, and responsible for the deaths of many under-water exploration teams, and the destruction of unmanned boats and submarines at the surface of Vorcium. The Krakens were driven close to extinction after humanity killed as many Krakens as they could find.

History
Humanity wondered what made the Krakens so smart as a species, some groups of Krakens even spoke among each other in an odd language. After much investigation and review over their species, it was believed that Humanity was not the first species on Vorcium, however, this was proven wrong as the Krakens were among the oldest species on Vorcium, they learned quickly from their experience, and out of pure luck and natural selection, their species were the most intelligent creatures on Vorcium, though they did not know much.

Near extinction
After discovery by the Humans, the Krakens were feared by humanity, and that fear grew into hate, which led Humanity to go on a campaign against these creatures, killing as many as they could find. The surviving Krakens retreated to the bottom of the ocean, to they could escape Humanity's wrath. After the supposed extinction of the Krakens, Humanity began to colonize Vorcium. The Krakens survived, but they were not allowed near the surface, or they would face another attack.