The Aurora Stone

Great Britain, ca. late 17th century, AD.
An egg shaped crystal with the ability to channel dream energy.
The Third Circle, Arcane Society Book 4.

The egg shaped Aurora Stone is a powerful crystal that, in the hands of an individual who possesses the appropriate talent, can channel dangerous dream energy. The artifact once belonged to the woman known in Arcane legend as Sybil the Virgin Sorceress, a crystal worker who assisted Sylvester Jones in some of his early research. In the hands of a strong crystal-talent, the stone becomes a luminous weapon.