The Quill is one of the few Items that have led to madness of it's user.  Activated by tapping the writing end of the Quill on a hard surface such as a table will cause a copper piece to be generated.

The last known user of this Item attempted to make himself rich by using it's ability constantly. After a long time of tapping the Quill the question of where the copper pieces came from plagued his mind. After prolonged use, he eventually tapped his brains out.