Damn, this was brutal.  Especially his memories of Menegroth, but really the whole thing.  You really brought 'being haunted' to terrifying life (pardon the unintentional pun there).  I really liked the twins' little rebellions layered over the general horror.  I'm sure it's only because they're twins, but they did give some creepy Shining vibes at times.  

I very much enjoy Maglor going just a little bit mad. (or a lot bit)  Of all the moments, I think his return to the 'ruin' of Amon Ereb maybe hit hardest.