Nidhogg
In
Norse mythology,
Nidhogg ("tearer of corpses") was the monster that ate the roots of the World Tree,
Yggdrasil and swore at the eagle living in the tree's branches. Nidhogg also ate corpses.
Other serpents who ate Yggdrasil: Graback, Grafvolluth, Goin, Moin.
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