A hunter who is more into trophies than hunting would be a collector in my book. To a hunter, the hunt would be more important than the catch. Therefore, despite the players combat junkieness, I don't know if just a weapon would fit.
On that note, how about something along the line of Jack Sparrows compass (it always points to what you want most)? This could in return lead to more artefacts (and of course trouble) he could find with it.
Also, there is a figure in Germanic mythology, Alberich, who is equivalent of Oberon. He was in possession of a cloak of invisibility, that he might be willing to give his emissary.