A small Moonstone with a half moon engraved on one side.

With this stone in your possession you gain an extra use of wild shape every short rest. You can also communicate with people telepathically while in wild shape. 

The Moonstone fills your mind with knowledge of every beast possible for you to wild shape into whether you have seen that beast or not. It will also alert you telepathically if you are within one mile of a Heart Seed.