Karchars and Leviathan are apex predators. But their origins are not very well known.

They are an ancient species, about one thousand years old. Their vision has degraded, but their hearing and olfactory system are extraordinary. These two species look similar, so scholars believed that they originated from the same family.

But documents from the Temple of Truth tell different story. Leviathan made its first appearance when the red fog first came, and at the time Leviathan didn't look very different compared to now. On the other hand, Karchars were quite different back then, and evolved into their current form.

When considering the average speed of evolution, it would be safe to assume that Leviathan was already its current form, even before the red fog came.

It means Leviathan was already exposed to a certain element before the earthquake and finished evolving into its current form, and it is possible that this element was the primary source of the red fog.

This theory also could explain why Leviathan is much faster than Karchars, and can create red fog-like aura to influence nearby creatures.

The source element of the red fog will be my next research topic.

- Shark researcher, Aria Kresswell.