Hamadryad egg

Hamadryad eggs were stones used as a holy symbol by worshipers of the Treefather.

Description
Hamadryad eggs were white egg-shaped stones bearing a carved symbol representing an oak leaf. The carving would turn green when used by a faithful to focus divine magic.

Powers
Some eggs were known to empower the casting abilities of their users, and granted them limited teleportation abilities.

History
The first egg was carved by a cleric of Silvanus, who offered it as a joke to Metiai, a hamadryad. It was said that on the night of the next full moon, she gave the cleric the stone back imbued with potent enchantments.