Idril

et galea Euryalum sublustri noctis in umbra
prodidit immemorem radiisque adversa refulsit
-Vergilius

And the helmet of heedless Euryalus,
half-lit in the shadow of night,
betrayed and revealed him,
reflecting against it the rays of the moon

Various internet pursuits:

http://flavors.me/idrilreid