Never been seen
Stoik the viking on nightfurys
The night fury is one of the most powerfull dragons in the west one of the reasons of this is its powerfull flame blasts, while most dragons fire blast will be red and simply fire however the night fury's blast will be solid electrisity powerfull enough to destroy a thick steel wall. The night fury is one of the hardest dragons to train as it needs a very strong bond whitch may take years or minutes either way it may attack or runaway but once the bond is made if you are in trouble the nightfury will apear destroying whatever troubles you.
The nightfurys home is unknown as they are disliked wherever they go but as they were rumerd to be hunted by vikings so by chance it could be Sweden like the Lindworm or mabey Norway no one knows for sure.