[TOMT] [BOOK] [2000?] The Fae-slaying YA novel series?

So I remember it had something to do with Caliburn, although I can't recall if the sword was an actual object or the last name of a character. The characters used iron weapons to damage the various fae creatures they faced, and a girl used a sack of nails, notably. There was a fight on a plane with Kobolds, I believe, although I may be confusing that detail with the Artemis Fowl series. I can't find it thanks to the sheer amount of use of the fae, and the lack of a pop culture tab on any resource I can find to do with Oberon, who I believe was the main antagonist. TIA for the help.