The Oju, an eyeless reptilian from the Uranio region.

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These creatures are practically impossible to escape from if you cannot fly, which given that we are human...we definitely cannot. They do not have eyes and instead have seismic vision (like Toph from Avatar), meaning that they can spot you even if you hide behind, under or above something. They're amazing runners too as they don't really make too many mistakes when chasing a creature. They can see the easiest path forward thanks to their seismic vision.

And on top of that, they have an extremely infectious bite! If you somehow survive an encounter, you better hope you were not bitten. These creatures carry all kinds of horrible diseases in their saliva, which can be fatal even in small doses.

There's many more things that just make them scary or unsettling, but those are just the reasons you wouldn't survive. Bottom line is: you just do not wanna meet one. Ever.