Så här säger Encyclopedia of Arda:
Citera:
The Watcher is a unique being, nowhere else alluded to, and in fact we cannot even say for certain that it was a single creature. It's generally depicted as a many-tentacled squid-like monster, but in fact Tolkien never states this certainly. Indeed, when Frodo asks Gandalf 'What was the thing, or were there many of them?', Gandalf's only answer is 'I do not know.' (The Fellowship of the Ring II 4 A Journey in the Dark.
Angående de varelser/ den varelse Fëanor gissade var samma som The Watcher in the Water:
Citera:
"Far, far below the deepest delvings of the Dwarves, the world is gnawed by nameless things."
Words of Gandalf from The Two Towers III 5 The White Rider
The secret and very ancient creatures that dwell in the dark depths of the world. Gandalf came upon them in the depths beneath Moria, but would say nothing of them to his companions. All we know of them is that they gnawed dark tunnels far beneath the earth, through which Gandalf escaped from the depths of the chasm beneath Khazad-dûm.
On the subject of these creatures, Gandalf says 'Even Sauron knows them not. They are older than he.' (The Two Towers III 5, The White Rider). Sauron is older than the World itself, so this can't be literally true, unless Gandalf means to suggest that the nameless things are Maiar (which seems rather implausible). Nonetheless, it is clear that these are very ancient creatures indeed.
Förresten, jag har inte tänkt på hur hemskt det måste ha varit för dvärgarna i Moria innan de dog. Jag säger bara:
"The Watcher in the Water took Oín. We cannot get out."