Magic amulet used by Queen Callista of Megalith City to defend against the Pastmaster. It is a teardrop shaped green stone set in a gold ornate setting and work around the neck. It emits blasts of glowing green magic energy to take down foes. When the Queen was abducted from her bedroom by two of the Pastmaster’s harpies, one of them ripped the amulet from around her neck and crushed it in its talons.
The amulet’s appearance in the flashback scene in The Deadly Pyramid is an error. At the time the Pastmaster had Callista chained up and was offering her the engagement ring in, her amulet had already been taken away from her and destroyed, so she shouldn’t be wearing it.