Others extend this even further to vaguely outlined (but not actually written, to the best of anyone's knowledge!) plans & ideas in personal correspondence
If you mean me here, as I say, in my opinion only work published by JRRT himself is canon.
Also Is
Dagor Dagorath Cannon or not?
To drag out some citations . . . with more opinions about certain posthumously published texts . . .
. . . without going into the longer textual history here, the in-story source of the Dagor Dagorath was revised. In other words, the Dagor Dagorath was once imagined to be part of a prophecy uttered by a "
god" (the
Vala,
Mandos) -- called The Second Prophecy of Mandos --
and then it became a
Mannish (
Numenorean myth), rather.
Citations concerning this include:
"The Second Prophecy of Mandos had now therefore definitively disappeared." Christopher
Tolkien, commentary to the
Valaquenta, The Later
Quenta Silmarillion II,
Morgoth's Ring
"The myth that appears at the end of the Silmarillion is of Numenorean origin; it is clearly made by Men, though Men acquanted with Elvish tradition." JRR Tolkien, note 7 to the Commentary to Athrabeth
Finrod ah Andreth, Morgoth's Ring
". . . that was of old the fate of Arda Marred; and if any change shall come and the marring be amended, Manwe and Varda may know; but they have not revealed it, and it is not declared in the dooms of Mandos." JRRT, Valaquenta, Morgoth's Ring
And neither the Second Prophecy of Mandos nor the Dagor Dagorath appear in Christopher Tolkien's Silmarillion, published in 1977. Yet that said, for example, at least one reference to a "Last Battle" does appear in the
Quenta Silmarillion section of
The Silmarillion, with reference to
Menelmacar (Orion).
Drawing a Biblical comparison for a moment (instead of Norse comparisons to Ragnarok), it might be somewhat like
The Book of Revelation being seen as representing visions through holy inspiration -- but then being "revised" to representing a myth made by Men rather -- granted "Mannish Myth" isn't really giving the reader much to go on as far as how
it came to be a myth, for instance, but maybe the coming book,
The Nature of Middle-Earth, will add something here.
Anyway, if indeed Tolkien had chosen to publish this myth, it would be canon in my opinion.
the Túrin part
Another question (for me) here is:
if Tolkien intended to keep the Dagor Dagorath as described in the 1930s (or even including the cursory corrections in the 1950s), there's a text dated
1968 or later to consider -- once again, the growingly famous Prophecy of Andreth from (a note to)
The Problem of ROS!
In Andreth's prophecy (we are back to prophecy now, but obviously not from the mouth of a Vala here), Túrin returns from the dead
at the end of the First Age -- not at the end of the World -- and slays
Ancalagon. The description includes:
" . . . before he left the Circles of the World forever, should challenge the Great Dragon of Morgoth . . ."
Thus, in earlier references, Túrin returns from the dead to participate in a Dagor Dagorath, but now, in a text dated 1968 or later, a prophecy gives his return at the end of the First Age rather, with no mention of the Dagor Dagorath -- and this is seemingly, as Christopher Tolkien states, Túrin's last deed within the World Circles:
" . . . and his last deed within the Circles of the World will be the slaying of the Great Dragon, Ancalagon the Black."
His last deed within the Circles of the World? But even
if Túrin is not going to return for a Last Battle at the End of Days, would that necessarily mean the entire earlier description of the Dagor Dagorath has
certainly disappeared?
No, not necessarily in my opinion.
It does make me wonder though
And some might characterize this late prophecy of Andreth as a possibly ephemeral idea, for instance
. . . but in any case, here are some citations to chew on.
