This necklace contains the power to transform the wearer into a beast. (See druid wild shape ability).
Druids were tired of the restriction on their use of wild shape, so they developed this amulet.
How to Use
Swipe your thumb over the acorn while envisioning the form you wish to take. You may do this twice per long rest.
Turns the user into the form of the beast (s)he was picturing. (See druid wild shape for details and limitations)