Lapis Philosophorum

Lapis Philosophorum was a mystical stone, sometimes known as The Philosopher's Stone.

History
The Lapis Philosophorum was a much sought after object used in alchemy to create gold from base metals such as lead.

Many years ago, the evil loan shark Lucio Zangari burnt the home of Niccolo Machiavelli. Mac threw the stone at Zangari but he caught it and threw it at Mac, severely injuring him. From that moment onwards, Mac kept the stone with him intent on revenge.

Years later, Mac used the stone to trick and con Zangari of 10000 florins. (Something Wicked)