Fatal or maddening gaze

Uktena

Its gaze or breath is said to be capable of killing or overwhelming a person outright

Ninki Nanka

A central and consistently attested belief is that merely seeing the Ninki Nanka is dangerous: in many tellings, those who glimpse it are said to fall ill, go mad, or die soon afterward, and the creature is sometimes invoked by elders as a warning to children to stay away from certain waterways.

Qiqion

What is consistently attributed to Qiqion is a single dangerous effect: anyone, human or dog, who sees it directly, or in some accounts merely crosses its tracks, is said to fall into violent convulsions resembling a seizure.