Take the Blue-feathered Necklace to Nara Wildmane.
Part 2 of 2 in this series
While I do possess much knowledge about the owlbeasts you defeated in Winterspring, I am not very learned on the subject of the magics they wield. But I do believe I know of one that would be able to examine the necklace and most likely tell you what it is. Nara Wildmane in Thunder Bluff is an expert in this field; see her. Good luck, Hero.
How may I help you, Hero?
The energy of this necklace, Hero. I believe that it has only one source. <Nara closes her eyes and is quiet for a moment.> The wildkin, now misguided and confused, were once not so. They once had a purpose, and were guided to serve. The night elf goddess Elune created these creatures to guard her most sacred areas. While this fact may seem like it holds little value; I urge you to look deeper. You will learn, in time. Thank you for bringing this to me, Hero.
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