Drake Tooth Necklace

The Drake Tooth Necklace is a good nature resistance necklace for healers.

Source
This item is a reward from the quest The Nightmare Manifests which starts with in Moonglade. To complete the quest, you must defeat and return to Keeper Remulos. This quest is part of the The Scepter of the Shifting Sands quest chain to open the Gates of Ahn'Qiraj.