Ne'er meaning never I'm assuming.

so poem is (in basic english, from my interpitation)

The moon can't rise with out the setting sun.
The sky will glow like a flame (sunset) And caves (hell) will darken and grow more menecing (seeps black dooms)
life will quicky grow from death
time for arms will be needed

that is pretty much what My understanding is.

what i feel it means

During the twilight hour between sunset and moon rising, when the sky glows and that caves that stretch under Erozea grow darker.
New life will grow where their was once death
And during this time is when we will need to forge and be ready for impending doom.

aka.... shit gonna happen in that creepy undead place where that dragon lies dead and we are all skrewed.

thats my theories based on the poems