A creature of unknown species or motivation, Nithhogg hails from the mysterious Interface between the human world and the Digital world. Hellbent on entering the Digital world, it has forced its way through, warping its body and the digital space around it. But is has become sealed.

Its very presence excites any data molecules it comes into contact with, unleashing great power at the expense of stability. Its body is the source of the mysterious leeches that have plagued the Fire Kingdom, and it can feel the Digital World through them.

It appears to lack great intelligence, instead showing similar reactions to a child when confronted. While it does not seem malicious, its very presence is toxic to the Digital World and has been being rejected since its first appearance. As such it may react with hostility and should be approached with extreme caution.