[davem]

"Far, far below the deepest delvings of the Dwarves, the world is gnawed by nameless things.''

I just googled these:

"In Norse mythology, Yggdrasil ("The Terrible One's Horse"), also called the World Tree, is the giant ash tree that links and shelters all the worlds. Beneath the three roots the realms of Asgard, Jotunheim, and Niflheim are located. Three wells lie at its base: the Well of Wisdom (Mímisbrunnr), guarded by Mimir; the Well of Fate (Urdarbrunnr), guarded by the Norns; and the Hvergelmir (Roaring Kettle), the source of many rivers.

Four deer run across the branches of the tree and eat the buds; they represent the four winds. There are other inhabitants of the tree, such as the squirrel Ratatosk ("swift teeth"), a notorious gossip, and Vidofnir ("tree snake"), the golden cock that perches on the topmost bough. The roots are gnawed upon by Nidhogg and other serpents. On the day of Ragnarok, the fire giant Surt will set the tree on fire".

and:

"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."

These serpents are not nameless, of course, but they do gnaw at the 'roots' of the World Tree...

There's also an eagle involved. And I do begin to wonder about the similarity between Ratatosk & Radaghast