Thread:Njalm2/@comment-18812574-20141125053838/@comment-3403804-20141125193218

That's a water-dwelling shapeshifter, that typically appears in the shape of a gorgeous white horse, beckoning children to climb atop it's back, where they're stuck. Only to run down into the pond it lives in, drowning and then devouring them, letting their entrails float up to the surface.

That's what a Nøkk is. Often simply called Nøkken.