Green Hag's Amulet
The same symbol on the amulet can be found on the ring taken from Geoffry in Forlione which was used to identify him as part of the griffin dust operation.
Given to the party by Glionethil in Shoremere after finding it in the ashes where the green hag had been burned.
Magical power apparently resides within the amulet, Glionethil felt something, but was unable to determine what it magic it was.
After rescuing the spirit of Iulwen she told the party that there was an evil hidden inside, and that they should be careful with it.