NIDHOGG

[Norse] In Norse myth, Nidhogg ("tearer of corpses") is a monstrous serpent that gnaws almost perpetually at the deepest root of the World Tree Yggdrasil, threatening to destroy it. The serpent is always bickering with the eagle that houses in the top of the tree. Nidhogg lies on Nastrond in Niflheim and eats corpses to sustain itself. It is not the only serpent whose task it is to destroy the World Tree; other serpents include Graback, Grafvolluth, Goin and Moin.