Gwaihir, I think that the blade you meant to talk about was "Anguirel" the mate of Anglachel, and also forged by Eol. That smith wielded it until his execution in Gondolin, when it was taken from him and given to Maeglin. Maeglin then wielded it until his death at the same precipice where his father died.
I don't think it is definitively stated anywhere that all blades forged by the Elves in the First Age would glow in the proximity of Orcs. But it does make sense. I think that the Elves would want some kind of "alarm" so that they could be on their guard. The only drawback to that was that they would lose the element of surprise. It's hard even for an Orc with bad eye-sight to miss a glowing blue blade, which would completely ruin any ambushes.
__________________
But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
|