Wow, you guys are really honing in on it. Moon and Valacirca are so close, I'd say you both pretty much nailed it. The answer is stars
First line speaks of Varda making them for the firstborn
Second refers to the 2nd battle, battle under the stars
Third is Earendil's Star, which gave hope to the people of ME that the Ainur hadn't forgotten them
Fourth refers to the Faithful's (dunedain) and Feanor's symbols
Fifth is just their location
Last refers to the Valacirca, Varda's warning to Morgoth
Good job guys... but now we need to get ehb's riddle. Close to Halls of Mandos, eh? I'll think about it some more.