Now
that's what I call a nice confusing riddle! There are so many (or at least it seems so) symbolical clues that its hard to tell what to take literally!
The first stanza reminds me of the Fall of Numenor. I have no clue who the "mother" can be, though.
The last stanza sounds like Maeglin - betrayal during a raid. But he didn't remain. That last line makes me thik this is not about any character, but rather a thing or concept. But then how can it have a mother?
Total nonsense, I know. But it might give some ideas to someone smarter.