The Eye of Isis.

A brilliant blue stone which was said to seem to burn from within, and was the size of a man's fist. It was at least as old as ancient Egyptian civilization, and was placed a statue of the goddess Isis. When removed from the statue, it lost its blue color. A great battle was fought for the stone, but it was lost to time, until it reappeared in England during John Dee's time. By then, it had decreased in size, but he regarded it as very precious and kept it secure in his rooms, saying it was vital to the Queen's wellbeing. After his death, it was moved to the Tower of London. 
The Eye of Isis was one of a series of eight powerful stones. At some point in the distant past, they were placed around the city of London in certain key locations. The seventh stone, the Eye of Isis, was designed to move and was traditionally put in the crown of the king, but it was stolen, and it was smashed. 
In 1671, Thomas Blood went to the Tower of London and took the jewels belonging to the king. When he was caught, he would only speak to the king, who, surprisingly, pardoned him. 
But the Eye of Isis was not returned, and it is said it was broken into a dozen pieces, and each of these pieces contains the power to destroy ghosts. 
The stones are also said to possess certain powers to control openings between the worlds of the living and the dead.
The Shadow Cabinet is an organization secretly dedicated to guarding these stones.
Category:Objects
Category:The Shadow Cabinet