Niddhoggr

In Norse mythology, '''Níðhöggris a dragon/serpent who gnaws at a root of the world tree, Yggdrasil. In historical Viking society, níð was a term for a social stigma implying the loss of honor and the status of a villain. Thus, its name might refer to its role as a horrific monster in its action of chewing the corpses of the inhabitants of Náströnd: those guilty of murder, adultery, and oath-breaking, which Norse society considered among the worst possible.'''

Appearances

Aside from the book Niddhoggr appears in:

The Nidhogg appears in games such as Fate of the Norns,Tower of Saviors, Age of Mythology, Final Fantasy XI, Final Fantasy XIV, Megami Tensei, World of Warcraft, Ragnarok Online, and the 2014 indie fencing game Nidhogg, as well as its 2017 sequel, Nidhogg 2.

Although not in the game, Nidhogg is shown as a comparison for Alduin, the main antagonist of The Elder Scrolls V: Skyrim, in the sense both feed on the dead and are the symbols of destruction. In Alduin's case he feeds on the souls of the dead in Sovngarde, the afterlife of the natives of Skyrim and is prophecised to bring the end of the world, gaining the title World-Eater which could be a reference to Nidhogg's gnawing at the roots of Yggdrasil.

In Eve Online, a class of capital ships, the Minmatar carrier, are called Nidhoggur. The Minmatar Republic in the game often uses Norse mythology in ship class names, such as Loki, Hel, and Ragnarok.

Nidhogg is the subject of the song "On a Sea of Blood" from the album Jomsviking by Swedish melodic death metal band Amon Amarth.

Another reference, albeit small, is the 50% form of Zygarde, a serpentine style Pokémon known as the Order Pokémon. This goes along with Xerneas, the Life Pokémon, being the stag of life, Dvalinn, and Yveltal, the Destruction Pokémon, being Hraesvelgr.

Niðhöggr appears in Ichiei Ishibumi's light novel series High School DxD.

Nidhogg appeared in 2014 manga To The Abandoned Sacred Beasts (by manga author Maybe) as a giant muscular dragon with a great life-force and abilities of attack and defence, incarnated in special soldier "John William Bancroft" who used his monstrous ability during the civil war on the government's side. After the war he returned as a war hero, but lost the ability to return to his human form thus losing his humanity slowly to his monster side. Later he was killed by his former Captain "Hank Henriette".

Nidhogg is also the name of a bow in both Fire Emblem: The Sacred Stones and Fire Emblem Heroes.

Nidhogg appears as a monster in the fantasy book The Magician: The Secrets of the Immortal Nicholas Flamel by Michael Scott.

In the Korean manhwa, Ragnarok: Into the Abyss, Nidhogg is featured as the Queen of Dragons who is able to destroy an army of Titans under the control of Valkyrie Sarah Irine. It also appears in the Korean web novel The Book Eating Magician.

Nidhogg's eye is the button found in a carving of Yggdrasil the Red Skull pushes to reveal the Tesseract in the Marvel film Captain America: The First Avenger.

In 2018 Philippine TV Series Victor Magtanggol, Nidhogg is a type of serpent with small arms and bat-like wings. He is Loki's pet, adviser, messenger and right hand which tell him what to do and how to help him defeat his enemies.

Niðhöggr is seen gnawing the root of Yggdrasil in the 2015 game Jotun during a section of the game taking place in the roots of Yggdrasil

Nidhogg appears as a sub-boss in the Roots of Yggdrasil in the 2018 game La-Mulana 2.

In the 2019 video game Devil May Cry 5, the Nidhogg parasite helps you progress through the story by killing parts of the demon trees roots. This may be a direct reference to the Yggdrasil and how Nidhogg eats its roots. Nidhogg is also a boss fight in this video game.

In the anime series Soul Eater, Nidhogg is the name of the ghost ship captained by The Flying Dutchman villain. In the belly of the ship, a large amount of souls are stored and the character Ragnarok arrives to eat the souls.